{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,1,19]],"date-time":"2025-01-19T05:17:07Z","timestamp":1737263827417,"version":"3.33.0"},"reference-count":81,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,4,19]],"date-time":"2024-04-19T00:00:00Z","timestamp":1713484800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"BMBF (German Ministry of Research and Education)","award":["01LG1904A"]},{"name":"DFG (Deutsche Forschungsgemeinschaft, German Research Foundation)","award":["404\/27-1"]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"This study presented an analysis of the geometric and optical properties of cirrus clouds with data produced by Compact Cloud-Aerosol Lidar (ComCAL) over Koror, Palau (7.3\u00b0N, 134.5\u00b0E), in the Tropical Western Pacific region. The lidar measurement dataset covers April 2018 to May 2019 and includes data collected during March, July and August 2022. The results show that cirrus clouds occur approximately 47.9% of the lidar sampling time, predominantly between altitudes of 15 and 18 km. Seasonal variations in cirrus top height closely align with those of the cold point tropopause. Most cirrus clouds exhibit low cloud optical depth (COD < 0.1), with an annual mean depolarization ratio of 31 \u00b1 19%. Convective-forming cirrus clouds during the summer monsoon season exhibit a larger size by notably lower values in terms of color ratio. Extremely thin cirrus clouds (COD < 0.005) constituting 1.6% of total cirrus occurrences are frequently observed at 1\u20132 km above the cold point, particularly during winter and summer, suggesting significant stratosphere\u2013troposphere exchange. The coldest and highest tropopause over Palau is persistent during winter, and related to the pathway of tropospheric air entering the stratosphere through the cold trap. In summer, the extremely thin cirrus above the cold point is likely correlated with equatorial Kelvin waves induced by western Pacific monsoon convection.<\/jats:p>","DOI":"10.3390\/rs16081448","type":"journal-article","created":{"date-parts":[[2024,4,19]],"date-time":"2024-04-19T10:28:09Z","timestamp":1713522489000},"page":"1448","source":"Crossref","is-referenced-by-count":1,"title":["Properties of Cirrus Cloud Observed over Koror, Palau (7.3\u00b0N, 134.5\u00b0E), in Tropical Western Pacific Region"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-9365-3171","authenticated-orcid":false,"given":"Xiaoyu","family":"Sun","sequence":"first","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, 28359 Bremen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1433-8371","authenticated-orcid":false,"given":"Christoph","family":"Ritter","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6891-6889","authenticated-orcid":false,"given":"Katrin","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Telegrafenberg A43, 14473 Potsdam, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7191-6911","authenticated-orcid":false,"given":"Mathias","family":"Palm","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, 28359 Bremen, Germany"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-0498-7551","authenticated-orcid":false,"given":"Denghui","family":"Ji","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, 28359 Bremen, Germany"}]},{"given":"Wilfried","family":"Ruhe","sequence":"additional","affiliation":[{"name":"Impres GmbH, Varreler Landstrasse 7, 28259 Bremen, Germany"}]},{"given":"Ingo","family":"Beninga","sequence":"additional","affiliation":[{"name":"Impres GmbH, Varreler Landstrasse 7, 28259 Bremen, Germany"}]},{"given":"Sharon","family":"Patris","sequence":"additional","affiliation":[{"name":"Coral Reef Research Foundation, Koror 96940, Palau"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3324-885X","authenticated-orcid":false,"given":"Justus","family":"Notholt","sequence":"additional","affiliation":[{"name":"Institute of Environmental Physics, University of Bremen, 28359 Bremen, Germany"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Sassen, K., Wang, Z., and Liu, D. (2008). Global distribution of cirrus clouds from CloudSat\/Cloud-Aerosol lidar and infrared pathfinder satellite observations (CALIPSO) measurements. J. Geophys. Res. Atmos., 113.","DOI":"10.1029\/2008JD009972"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Sassen, K., Wang, Z., and Liu, D. (2009). Cirrus clouds and deep convection in the tropics: Insights from CALIPSO and CloudSat. J. Geophys. Res. Atmos., 114.","DOI":"10.1029\/2009JD011916"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1167","DOI":"10.1175\/1520-0493(1986)114<1167:IOCCOW>2.0.CO;2","article-title":"Influence of Cirrus Clouds on Weather and Climate Processes: A Global Perspective","volume":"114","author":"Liou","year":"1986","journal-title":"Mon. Weather. Rev."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"54","DOI":"10.1038\/nclimate1068","article-title":"Global radiative forcing from contrail cirrus","volume":"1","author":"Burkhardt","year":"2011","journal-title":"Nat. Clim. Change"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Haladay, T., and Stephens, G. (2009). Characteristics of tropical thin cirrus clouds deduced from joint CloudSat and CALIPSO observations. J. Geophys. Res. Atmos., 114.","DOI":"10.1029\/2008JD010675"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"9166","DOI":"10.1002\/2014GL062095","article-title":"Cirrus feedback on interannual climate fluctuations","volume":"41","author":"Zhou","year":"2014","journal-title":"Geophys. Res. Lett."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Fueglistaler, S., Wernli, H., and Peter, T. (2004). Tropical troposphere-to-stratosphere transport inferred from trajectory calculations. J. Geophys. Res. Atmos., 109.","DOI":"10.1029\/2003JD004069"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Fueglistaler, S., Dessler, A.E., Dunkerton, T.J., Folkins, I., Fu, Q., and Mote, P.W. (2009). Tropical tropopause layer. Rev. Geophys., 47.","DOI":"10.1029\/2008RG000267"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Immler, F., Kr\u00fcger, K., Tegtmeier, S., Fujiwara, M., Fortuin, P., Verver, G., and Schrems, O. (2007). Cirrus clouds, humidity, and dehydration in the tropical tropopause layer observed at Paramaribo, Suriname (5.8\u00b0N, 55.2\u00b0W). J. Geophys. Res. Atmos., 112.","DOI":"10.1029\/2006JD007440"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Fu, Q., Smith, M., and Yang, Q. (2018). The Impact of Cloud Radiative Effects on the Tropical Tropopause Layer Temperatures. Atmosphere, 9.","DOI":"10.3390\/atmos9100377"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Lynch, D.K. (2002). Cirrus, Oxford University Press.","DOI":"10.1093\/oso\/9780195130720.001.0001"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"4019","DOI":"10.5194\/acp-8-4019-2008","article-title":"Correlation between equatorial Kelvin waves and the occurrence of extremely thin ice clouds at the tropical tropopause","volume":"8","author":"Immler","year":"2008","journal-title":"Atmos. Chem. Phys."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"6094","DOI":"10.1002\/2017JD026632","article-title":"Physical processes controlling the spatial distributions of relative humidity in the tropical tropopause layer over the Pacific","volume":"122","author":"Jensen","year":"2017","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"DeMott, P. (2002). Cirrus: Laboratory Studies of Cirrus Cloud Processes, Oxford University Press.","DOI":"10.1093\/oso\/9780195130720.003.0009"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"3463","DOI":"10.5194\/acp-16-3463-2016","article-title":"A microphysics guide to cirrus clouds \u2013 Part 1: Cirrus types","volume":"16","author":"Rolf","year":"2016","journal-title":"Atmos. Chem. Phys."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"9765","DOI":"10.1029\/2000JD900648","article-title":"Aircraft observations of thin cirrus clouds near the tropical tropopause","volume":"106","author":"Pfister","year":"2001","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Comstock, J.M., and Jakob, C. (2004). Evaluation of tropical cirrus cloud properties derived from ECMWF model output and ground based measurements over Nauru Island. Geophys. Res. Lett., 31.","DOI":"10.1029\/2004GL019539"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2162","DOI":"10.1175\/1520-0442(1993)006<2162:ASDCOT>2.0.CO;2","article-title":"A Satellite-derived Climatology of the ITCZ","volume":"6","author":"Waliser","year":"1993","journal-title":"J. Clim."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"7075","DOI":"10.5194\/acp-23-7075-2023","article-title":"Determination of the chemical equator from GEOS-Chem model simulation: A focus on the tropical western Pacific region","volume":"23","author":"Sun","year":"2023","journal-title":"Atmos. Chem. Phys."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2799","DOI":"10.1029\/2001GL013148","article-title":"Horizontal transport and the dehydration of the stratosphere","volume":"28","author":"Holton","year":"2001","journal-title":"Geophys. Res. Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"825","DOI":"10.1029\/96GL00722","article-title":"Dehydration of the upper troposphere and lower stratosphere by subvisible cirrus clouds near the tropical tropopause","volume":"23","author":"Jensen","year":"1996","journal-title":"Geophys. Res. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Fujiwara, M., Iwasaki, S., Shimizu, A., Inai, Y., Shiotani, M., Hasebe, F., Matsui, I., Sugimoto, N., Okamoto, H., and Nishi, N. (2009). Cirrus observations in the tropical tropopause layer over the western Pacific. J. Geophys. Res. Atmos., 114.","DOI":"10.1029\/2008JD011040"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"851","DOI":"10.5194\/acp-5-851-2005","article-title":"Ice supersaturations exceeding 100% at the cold tropical tropopause: Implications for cirrus formation and dehydration","volume":"5","author":"Jensen","year":"2005","journal-title":"Atmos. Chem. Phys."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3984","DOI":"10.1029\/2018JD029849","article-title":"Water Vapor, Clouds, and Saturation in the Tropical Tropopause Layer","volume":"124","author":"Schoeberl","year":"2019","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1275","DOI":"10.1175\/1520-0450(1992)031<1275:STCLDF>2.0.CO;2","article-title":"Subvisual-Thin Cirrus Lidar Dataset for Satellite Verification and Climatological Research","volume":"31","author":"Sassen","year":"1992","journal-title":"J. Appl. Meteorol. Climatol."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1841","DOI":"10.1175\/1520-0469(2000)057<1841:TASTTC>2.0.CO;2","article-title":"Thin and Subvisual Tropopause Tropical Cirrus: Observations and Radiative Impacts","volume":"57","author":"McFarquhar","year":"2000","journal-title":"J. Atmos. Sci."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"851","DOI":"10.1175\/1520-0469(1986)043<0851:IPOIAC>2.0.CO;2","article-title":"Ice Particles Observed in a Cirriform Cloud at \u221283 \u00b0C and Implications for Polar Stratospheric Clouds","volume":"43","author":"Heymsfield","year":"1986","journal-title":"J. Atmos. Sci."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"12081","DOI":"10.5194\/acp-12-12081-2012","article-title":"On the origin of subvisible cirrus clouds in the tropical upper troposphere","volume":"12","author":"Reverdy","year":"2012","journal-title":"Atmos. Chem. Phys."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"403","DOI":"10.1029\/95RG02097","article-title":"Stratosphere-troposphere exchange","volume":"33","author":"Holton","year":"1995","journal-title":"Rev. Geophys."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"729","DOI":"10.1175\/1520-0469(1987)044<0729:RSOHCP>2.0.CO;2","article-title":"Remote Sounding of High Clouds. Part VI: Optical Properties of Midlatitude and Tropical Cirrus","volume":"44","author":"Platt","year":"1987","journal-title":"J. Atmos. Sci."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1977","DOI":"10.1175\/1520-0469(1998)055<1977:TOPOEC>2.0.CO;2","article-title":"The Optical Properties of Equatorial Cirrus from Observations in the ARM Pilot Radiation Observation Experiment","volume":"55","author":"Platt","year":"1998","journal-title":"J. Atmos. Sci."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2103","DOI":"10.1175\/1520-0469(2001)058<2103:AMCCCF>2.0.CO;2","article-title":"A Midlatitude Cirrus Cloud Climatology from the Facility for Atmospheric Remote Sensing. Part II: Microphysical Properties Derived from Lidar Depolarization","volume":"58","author":"Sassen","year":"2001","journal-title":"J. Atmos. Sci."},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Pace, G., Cacciani, M., di Sarra, A., Fiocco, G., and Fu\u00e0, D. (2003). Lidar observations of equatorial cirrus clouds at Mah\u00e9 Seychelles. J. Geophys. Res. Atmos., 108.","DOI":"10.1029\/2002JD002710"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"723","DOI":"10.1016\/j.atmosres.2009.02.008","article-title":"Characteristics of cirrus clouds and its radiative properties based on lidar observation over Chung-Li, Taiwan","volume":"93","author":"Das","year":"2009","journal-title":"Atmos. Res."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1016\/j.jastp.2014.07.008","article-title":"Characteristics of cirrus clouds and tropical tropopause layer: Seasonal variation and long-term trends","volume":"121","author":"Pandit","year":"2014","journal-title":"J. Atmos. Sol. Terr. Phys."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"1771","DOI":"10.1175\/BAMS-83-12-1771","article-title":"THE CLOUDSAT MISSION AND THE A-TRAIN: A New Dimension of Space-Based Observations of Clouds and Precipitation","volume":"83","author":"Stephens","year":"2002","journal-title":"Bull. Am. Meteorol. Soc."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"13833","DOI":"10.5194\/acp-15-13833-2015","article-title":"Long-term trend analysis and climatology of tropical cirrus clouds using 16 years of lidar data set over Southern India","volume":"15","author":"Pandit","year":"2015","journal-title":"Atmos. Chem. Phys."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"7947","DOI":"10.5194\/acp-21-7947-2021","article-title":"Lidar observations of cirrus clouds in Palau (7\u00b0N, 134\u00b0E)","volume":"21","author":"Cairo","year":"2021","journal-title":"Atmos. Chem. Phys."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"2169","DOI":"10.5194\/acp-24-2169-2024","article-title":"Measurement report: The Palau Atmospheric Observatory and its ozonesonde record\u2014continuous monitoring of tropospheric composition and dynamics in the tropical western Pacific","volume":"24","author":"Tradowsky","year":"2024","journal-title":"Atmos. Chem. Phys."},{"key":"ref_40","unstructured":"M\u00fcller, K. (2020). Characterization of Ozone and the Oxidizing Capacity of the Tropical West Pacific Troposphere. [Ph.D. Thesis, Fachbereich Physik und Elektrotechnik der Universit\u00e4t]."},{"key":"ref_41","unstructured":"Global Modeling and Assimilation Office (GMAO) (2015). MERRA-2 tavgU_2d_ocn_Nx: 2d,diurnal, Time-Averaged, Single-Level, Assimilation, Ocean Surface Diagnostics, V5.12.4, Goddard Earth Sciences Data and Information Services Center (GES DISC)."},{"key":"ref_42","unstructured":"Nagasawa, C., and Sugimoto, N.I. (2006, January 24\u201328). A new LIDAR system for the detection of Cloud and aerosol backscatter, depolarization, extinction, and fluorescence. Proceedings of the 23rd International Laser Radar Converence, Nara, Japan."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"4463","DOI":"10.5194\/amt-7-4463-2014","article-title":"Reference quality upper-air measurements: GRUAN data processing for the Vaisala RS92 radiosonde","volume":"7","author":"Dirksen","year":"2014","journal-title":"Atmos. Meas. Tech."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"635","DOI":"10.1175\/JTECH-D-18-0081.1","article-title":"On the accuracy of Vaisala RS41 versus RS92 upper-air temperature observations","volume":"36","author":"Sun","year":"2019","journal-title":"J. Atmos. Ocean. Technol."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"2765","DOI":"10.1364\/AO.34.002765","article-title":"Rayleigh-scattering calculations for the terrestrial atmosphere","volume":"34","author":"Bucholtz","year":"1995","journal-title":"Appl. Opt."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"1638","DOI":"10.1364\/AO.24.001638","article-title":"Lidar inversion with variable backscatter\/extinction ratios","volume":"24","author":"Klett","year":"1985","journal-title":"Appl. Opt."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"8553","DOI":"10.1364\/OE.414770","article-title":"An extended lidar-based cirrus cloud retrieval scheme: First application over an Arctic site","volume":"29","author":"Nakoudi","year":"2021","journal-title":"Opt. Express"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.atmosenv.2016.05.053","article-title":"2014 iAREA campaign on aerosol in Spitsbergen\u2014Part 2: Optical properties from Raman-lidar and in situ observations at Ny-\u00c5lesund","volume":"141","author":"Ritter","year":"2016","journal-title":"Atmos. Environ."},{"key":"ref_49","first-page":"156","article-title":"On the atmospheric transmission of sun radiation and on dust in the air","volume":"11","year":"1929","journal-title":"Geogr. Ann."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"11853","DOI":"10.5194\/acp-13-11853-2013","article-title":"Midlatitude cirrus classification at Rome Tor Vergata through a multichannel Raman\u2013Mie\u2013Rayleigh lidar","volume":"13","author":"Dionisi","year":"2013","journal-title":"Atmos. Chem. Phys."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"7281","DOI":"10.5194\/acp-8-7281-2008","article-title":"Continuous monitoring of the boundary-layer top with lidar","volume":"8","author":"Baars","year":"2008","journal-title":"Atmos. Chem. Phys."},{"key":"ref_52","doi-asserted-by":"crossref","unstructured":"Nakoudi, K., Ritter, C., and Stachlewska, I.S. (2021). Properties of Cirrus Clouds over the European Arctic (Ny-\u00c5lesund, Svalbard). Remote Sens., 13.","DOI":"10.3390\/rs13224555"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"4427","DOI":"10.5194\/acp-20-4427-2020","article-title":"Variability in cirrus cloud properties using a PollyXT Raman lidar over high and tropical latitudes","volume":"20","author":"Voudouri","year":"2020","journal-title":"Atmos. Chem. Phys."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"1397","DOI":"10.5194\/amt-6-1397-2013","article-title":"Aerosol classification from airborne HSRL and comparisons with the CALIPSO vertical feature mask","volume":"6","author":"Burton","year":"2013","journal-title":"Atmos. Meas. Tech."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"5519","DOI":"10.5194\/acp-7-5519-2007","article-title":"Optical and geometrical characteristics of cirrus clouds over a Southern European lidar station","volume":"7","author":"Giannakaki","year":"2007","journal-title":"Atmos. Chem. Phys."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"5984","DOI":"10.1364\/AO.45.005984","article-title":"Fast approximate calculation of multiply scattered lidar returns","volume":"45","author":"Hogan","year":"2006","journal-title":"Appl. Opt."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"2464","DOI":"10.1364\/AO.37.002464","article-title":"Practical model for the calculation of multiply scattered lidar returns","volume":"37","author":"Eloranta","year":"1998","journal-title":"Appl. Opt."},{"key":"ref_58","unstructured":"Sun, X., Ritter, C., and Mueller, K. (ACCLIP: ComCAL Raman Lidar Data, 2023). ACCLIP: ComCAL Raman Lidar Data, Version 1.0."},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Seifert, P., Ansmann, A., M\u00fcller, D., Wandinger, U., Althausen, D., Heymsfield, A.J., Massie, S.T., and Schmitt, C. (2007). Cirrus optical properties observed with lidar, radiosonde, and satellite over the tropical Indian Ocean during the aerosol-polluted northeast and clean maritime southwest monsoon. J. Geophys. Res. Atmos., 112.","DOI":"10.1029\/2006JD008352"},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"3619","DOI":"10.5194\/acp-17-3619-2017","article-title":"Optical and geometrical properties of cirrus clouds in Amazonia derived from 1 year of ground-based lidar measurements","volume":"17","author":"Gouveia","year":"2017","journal-title":"Atmos. Chem. Phys."},{"key":"ref_61","doi-asserted-by":"crossref","unstructured":"Martins, E., Noel, V., and Chepfer, H. (2011). Properties of cirrus and subvisible cirrus from nighttime Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP), related to atmospheric dynamics and water vapor. J. Geophys. Res. Atmos., 116.","DOI":"10.1029\/2010JD014519"},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"1143","DOI":"10.1175\/JAS-D-13-0178.1","article-title":"Observations of Temperature, Wind, Cirrus, and Trace Gases in the Tropical Tropopause Transition Layer during the MJO","volume":"71","author":"Virts","year":"2014","journal-title":"J. Atmos. Sci."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"3113","DOI":"10.1175\/2010JAS3412.1","article-title":"Tropical tropopause transition layer cirrus as represented by CALIPSO lidar observations","volume":"67","author":"Virts","year":"2010","journal-title":"J. Atmos. Sci."},{"key":"ref_64","first-page":"1","article-title":"Air Mass Transport to the Tropical West Pacific Troposphere inferred from Ozone and Relative Humidity Balloon Observations above Palau","volume":"2023","author":"Wohltmann","year":"2023","journal-title":"EGUsphere"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"683","DOI":"10.5194\/acp-12-683-2012","article-title":"Correlation among cirrus ice content, water vapor and temperature in the TTL as observed by CALIPSO and Aura\/MLS","volume":"12","author":"Flury","year":"2012","journal-title":"Atmos. Chem. Phys."},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"9939","DOI":"10.5194\/acp-20-9939-2020","article-title":"Revisiting global satellite observations of stratospheric cirrus clouds","volume":"20","author":"Zou","year":"2020","journal-title":"Atmos. Chem. Phys."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"1369","DOI":"10.5194\/acp-10-1369-2010","article-title":"Ice nucleation and cloud microphysical properties in tropical tropopause layer cirrus","volume":"10","author":"Jensen","year":"2010","journal-title":"Atmos. Chem. Phys."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"4827","DOI":"10.5194\/acp-14-4827-2014","article-title":"A tropical West Pacific OH minimum and implications for stratospheric composition","volume":"14","author":"Rex","year":"2014","journal-title":"Atmos. Chem. Phys."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"1621","DOI":"10.5194\/acp-9-1621-2009","article-title":"The Tropical Tropopause Layer 1960\u20132100","volume":"9","author":"Gettelman","year":"2009","journal-title":"Atmos. Chem. Phys."},{"key":"ref_70","doi-asserted-by":"crossref","unstructured":"Gettelman, A., Forster, P.M.d.F., Fujiwara, M., Fu, Q., V\u00f6mel, H., Gohar, L.K., Johanson, C., and Ammerman, M. (2004). Radiation balance of the tropical tropopause layer. J. Geophys. Res. Atmos., 109.","DOI":"10.1029\/2003JD004190"},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"22095","DOI":"10.1029\/1999JD900404","article-title":"A barrier to vertical mixing at 14 km in the tropics: Evidence from ozonesondes and aircraft measurements","volume":"104","author":"Folkins","year":"1999","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"741","DOI":"10.1002\/2016JD025217","article-title":"Boundaries of tropical tropopause layer (TTL): A new perspective based on thermal and stability profiles","volume":"122","author":"Sunilkumar","year":"2017","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"911","DOI":"10.2151\/jmsj.80.911","article-title":"A climatology of the tropical tropopause layer","volume":"80","author":"Gettelman","year":"2002","journal-title":"J. Meteorol. Soc. Jpn. Ser. II"},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"1579","DOI":"10.1002\/qj.49712454911","article-title":"The tropical tropopause","volume":"124","author":"Highwood","year":"1998","journal-title":"Q. J. R. Meteorol. Soc."},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1002\/2014JD021846","article-title":"Structural diagnostics of the tropopause inversion layer and its evolution","volume":"120","author":"Gettelman","year":"2015","journal-title":"J. Geophys. Res. Atmos."},{"key":"ref_76","doi-asserted-by":"crossref","unstructured":"Birner, T., Sankey, D., and Shepherd, T.G. (2006). The tropopause inversion layer in models and analyses. Geophys. Res. Lett., 33.","DOI":"10.1029\/2006GL026549"},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"11617","DOI":"10.5194\/acp-16-11617-2016","article-title":"The tropical tropopause inversion layer: Variability and modulation by equatorial waves","volume":"16","author":"Matthes","year":"2016","journal-title":"Atmos. Chem. Phys."},{"key":"ref_78","doi-asserted-by":"crossref","unstructured":"Schmidt, T., Cammas, J.P., Smit, H.G.J., Heise, S., Wickert, J., and Haser, A. (2010). Observational characteristics of the tropopause inversion layer derived from CHAMP\/GRACE radio occultations and MOZAIC aircraft data. J. Geophys. Res. Atmos., 115.","DOI":"10.1029\/2010JD014284"},{"key":"ref_79","doi-asserted-by":"crossref","first-page":"3989","DOI":"10.5194\/acp-7-3989-2007","article-title":"The CO2 tracer clock for the Tropical Tropopause Layer","volume":"7","author":"Park","year":"2007","journal-title":"Atmos. Chem. Phys."},{"key":"ref_80","unstructured":"Sun, X. (2024). The Atmospheric Transport in the Western Pacific Region by Measurements and Model Simulations. [Ph.D. Thesis, Fachbereich Physik und Elektrotechnik der Universit\u00e4t]."},{"key":"ref_81","unstructured":"Henz, D.R. (2010). A Modeling Study of the Tropical Tropopause Layer. [Master\u2019s Thesis, University of Wisconsin]."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/8\/1448\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,1,18]],"date-time":"2025-01-18T07:17:48Z","timestamp":1737184668000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/16\/8\/1448"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,4,19]]},"references-count":81,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2024,4]]}},"alternative-id":["rs16081448"],"URL":"https:\/\/doi.org\/10.3390\/rs16081448","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2024,4,19]]}}}