Characteristics of the multiple tropopauses in the tropics

In a previous work (Mehta et al., 2011. J. Geophys. Res. 116, D20105, doi:10.1029/2011JD016637), we emphasized the limitations of the WMO definition of multiple tropopauses (MTs) which was based on the lapse rate in identifying them sometimes, and provided an alternate method called cold point metho...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of atmospheric and solar-terrestrial physics 2013-04, Vol.95-96, p.78-86
Hauptverfasser: Mehta, Sanjay Kumar, Ratnam, M. Venkat, Murthy, B.V. Krishna
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page 86
container_issue
container_start_page 78
container_title Journal of atmospheric and solar-terrestrial physics
container_volume 95-96
creator Mehta, Sanjay Kumar
Ratnam, M. Venkat
Murthy, B.V. Krishna
description In a previous work (Mehta et al., 2011. J. Geophys. Res. 116, D20105, doi:10.1029/2011JD016637), we emphasized the limitations of the WMO definition of multiple tropopauses (MTs) which was based on the lapse rate in identifying them sometimes, and provided an alternate method called cold point method, to delineate the MTs over the tropics effectively. In the present work we described the detailed characteristics of the MTs over the tropics identified using the cold point method. We have used COSMIC GPS RO data obtained during August 2006–August 2008 and radiosonde data from 5 stations during 1999–2008 in the ±15° latitude for the present study. There is a marked latitudinal variation within the tropics in the MTs and cold point tropopause (CPT) in different seasons. These MTs can occur both above and below the CPT. The saturation water vapor mixing ratio corresponding to the lower tropopause (MTs which occur below CPT) from November to May is in general ∼3ppmv indicating dry conditions even below the CPT altitude. The latitudinal variation of altitudes of the MTs and CPT showed quite different features. We also examined the role of equatorial waves in the occurrence of MTs. This wave mechanism could explain the MT occurrences that are in groups but not in the individual cases suggesting other mechanisms could also exist. ► Characteristics of the MTs over tropics and causative mechanisms presented. ► There is a marked latitudinal variation in MTs and CPT in different seasons. ► The SWVMR at LT is ∼3ppmv indicating dry conditions below the CPT. ► Wave mechanism could explain MTs that occur only in groups.
doi_str_mv 10.1016/j.jastp.2013.01.009
format Article
fullrecord <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_1323807284</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S1364682613000333</els_id><sourcerecordid>1323807284</sourcerecordid><originalsourceid>FETCH-LOGICAL-c402t-76b58261348c3ba5d412988b4c29ea6d5c1c7a9be4d07bf554193fd635d82f3c3</originalsourceid><addsrcrecordid>eNp9kE1LxDAQhoMouK7-Ai89emnNV9NU8CCLX7DgRc8hTaZsSndTk1Tw35u6nj3NMPO-M7wPQtcEVwQTcTtUg45pqigmrMKkwrg9QSsim7YkkvLT3DPBSyGpOEcXMQ4Y44ZKsUJ3m50O2iQILiZnYuH7Iu2g2M9jctMIRQp-8pOeI8TCHX53yyhLL9FZr8cIV391jT6eHt83L-X27fl187AtDcc0lY3o6vyXMC4N63RtOaGtlB03tAUtbG2IaXTbAbe46fq65qRlvRWstpL2zLA1ujnenYL_nCEmtXfRwDjqA_g5KsIok0scnqXsKDXBxxigV1Nwex2-FcFqIaUG9UtKLaQUJiqTyq77owtyii8HQUXj4GDAugAmKevdv_4fujNyvA</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1323807284</pqid></control><display><type>article</type><title>Characteristics of the multiple tropopauses in the tropics</title><source>Access via ScienceDirect (Elsevier)</source><creator>Mehta, Sanjay Kumar ; Ratnam, M. Venkat ; Murthy, B.V. Krishna</creator><creatorcontrib>Mehta, Sanjay Kumar ; Ratnam, M. Venkat ; Murthy, B.V. Krishna</creatorcontrib><description>In a previous work (Mehta et al., 2011. J. Geophys. Res. 116, D20105, doi:10.1029/2011JD016637), we emphasized the limitations of the WMO definition of multiple tropopauses (MTs) which was based on the lapse rate in identifying them sometimes, and provided an alternate method called cold point method, to delineate the MTs over the tropics effectively. In the present work we described the detailed characteristics of the MTs over the tropics identified using the cold point method. We have used COSMIC GPS RO data obtained during August 2006–August 2008 and radiosonde data from 5 stations during 1999–2008 in the ±15° latitude for the present study. There is a marked latitudinal variation within the tropics in the MTs and cold point tropopause (CPT) in different seasons. These MTs can occur both above and below the CPT. The saturation water vapor mixing ratio corresponding to the lower tropopause (MTs which occur below CPT) from November to May is in general ∼3ppmv indicating dry conditions even below the CPT altitude. The latitudinal variation of altitudes of the MTs and CPT showed quite different features. We also examined the role of equatorial waves in the occurrence of MTs. This wave mechanism could explain the MT occurrences that are in groups but not in the individual cases suggesting other mechanisms could also exist. ► Characteristics of the MTs over tropics and causative mechanisms presented. ► There is a marked latitudinal variation in MTs and CPT in different seasons. ► The SWVMR at LT is ∼3ppmv indicating dry conditions below the CPT. ► Wave mechanism could explain MTs that occur only in groups.</description><identifier>ISSN: 1364-6826</identifier><identifier>EISSN: 1879-1824</identifier><identifier>DOI: 10.1016/j.jastp.2013.01.009</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Cold point tropopause ; COSMIC GPS RO and radiosonde ; Equatorial planetary waves ; Multiple tropopauses</subject><ispartof>Journal of atmospheric and solar-terrestrial physics, 2013-04, Vol.95-96, p.78-86</ispartof><rights>2013 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c402t-76b58261348c3ba5d412988b4c29ea6d5c1c7a9be4d07bf554193fd635d82f3c3</citedby><cites>FETCH-LOGICAL-c402t-76b58261348c3ba5d412988b4c29ea6d5c1c7a9be4d07bf554193fd635d82f3c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.jastp.2013.01.009$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>315,781,785,3551,27926,27927,45997</link.rule.ids></links><search><creatorcontrib>Mehta, Sanjay Kumar</creatorcontrib><creatorcontrib>Ratnam, M. Venkat</creatorcontrib><creatorcontrib>Murthy, B.V. Krishna</creatorcontrib><title>Characteristics of the multiple tropopauses in the tropics</title><title>Journal of atmospheric and solar-terrestrial physics</title><description>In a previous work (Mehta et al., 2011. J. Geophys. Res. 116, D20105, doi:10.1029/2011JD016637), we emphasized the limitations of the WMO definition of multiple tropopauses (MTs) which was based on the lapse rate in identifying them sometimes, and provided an alternate method called cold point method, to delineate the MTs over the tropics effectively. In the present work we described the detailed characteristics of the MTs over the tropics identified using the cold point method. We have used COSMIC GPS RO data obtained during August 2006–August 2008 and radiosonde data from 5 stations during 1999–2008 in the ±15° latitude for the present study. There is a marked latitudinal variation within the tropics in the MTs and cold point tropopause (CPT) in different seasons. These MTs can occur both above and below the CPT. The saturation water vapor mixing ratio corresponding to the lower tropopause (MTs which occur below CPT) from November to May is in general ∼3ppmv indicating dry conditions even below the CPT altitude. The latitudinal variation of altitudes of the MTs and CPT showed quite different features. We also examined the role of equatorial waves in the occurrence of MTs. This wave mechanism could explain the MT occurrences that are in groups but not in the individual cases suggesting other mechanisms could also exist. ► Characteristics of the MTs over tropics and causative mechanisms presented. ► There is a marked latitudinal variation in MTs and CPT in different seasons. ► The SWVMR at LT is ∼3ppmv indicating dry conditions below the CPT. ► Wave mechanism could explain MTs that occur only in groups.</description><subject>Cold point tropopause</subject><subject>COSMIC GPS RO and radiosonde</subject><subject>Equatorial planetary waves</subject><subject>Multiple tropopauses</subject><issn>1364-6826</issn><issn>1879-1824</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LxDAQhoMouK7-Ai89emnNV9NU8CCLX7DgRc8hTaZsSndTk1Tw35u6nj3NMPO-M7wPQtcEVwQTcTtUg45pqigmrMKkwrg9QSsim7YkkvLT3DPBSyGpOEcXMQ4Y44ZKsUJ3m50O2iQILiZnYuH7Iu2g2M9jctMIRQp-8pOeI8TCHX53yyhLL9FZr8cIV391jT6eHt83L-X27fl187AtDcc0lY3o6vyXMC4N63RtOaGtlB03tAUtbG2IaXTbAbe46fq65qRlvRWstpL2zLA1ujnenYL_nCEmtXfRwDjqA_g5KsIok0scnqXsKDXBxxigV1Nwex2-FcFqIaUG9UtKLaQUJiqTyq77owtyii8HQUXj4GDAugAmKevdv_4fujNyvA</recordid><startdate>201304</startdate><enddate>201304</enddate><creator>Mehta, Sanjay Kumar</creator><creator>Ratnam, M. Venkat</creator><creator>Murthy, B.V. Krishna</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>201304</creationdate><title>Characteristics of the multiple tropopauses in the tropics</title><author>Mehta, Sanjay Kumar ; Ratnam, M. Venkat ; Murthy, B.V. Krishna</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c402t-76b58261348c3ba5d412988b4c29ea6d5c1c7a9be4d07bf554193fd635d82f3c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Cold point tropopause</topic><topic>COSMIC GPS RO and radiosonde</topic><topic>Equatorial planetary waves</topic><topic>Multiple tropopauses</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Mehta, Sanjay Kumar</creatorcontrib><creatorcontrib>Ratnam, M. Venkat</creatorcontrib><creatorcontrib>Murthy, B.V. Krishna</creatorcontrib><collection>CrossRef</collection><collection>Meteorological &amp; Geoastrophysical Abstracts</collection><collection>Meteorological &amp; Geoastrophysical Abstracts - Academic</collection><jtitle>Journal of atmospheric and solar-terrestrial physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Mehta, Sanjay Kumar</au><au>Ratnam, M. Venkat</au><au>Murthy, B.V. Krishna</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characteristics of the multiple tropopauses in the tropics</atitle><jtitle>Journal of atmospheric and solar-terrestrial physics</jtitle><date>2013-04</date><risdate>2013</risdate><volume>95-96</volume><spage>78</spage><epage>86</epage><pages>78-86</pages><issn>1364-6826</issn><eissn>1879-1824</eissn><abstract>In a previous work (Mehta et al., 2011. J. Geophys. Res. 116, D20105, doi:10.1029/2011JD016637), we emphasized the limitations of the WMO definition of multiple tropopauses (MTs) which was based on the lapse rate in identifying them sometimes, and provided an alternate method called cold point method, to delineate the MTs over the tropics effectively. In the present work we described the detailed characteristics of the MTs over the tropics identified using the cold point method. We have used COSMIC GPS RO data obtained during August 2006–August 2008 and radiosonde data from 5 stations during 1999–2008 in the ±15° latitude for the present study. There is a marked latitudinal variation within the tropics in the MTs and cold point tropopause (CPT) in different seasons. These MTs can occur both above and below the CPT. The saturation water vapor mixing ratio corresponding to the lower tropopause (MTs which occur below CPT) from November to May is in general ∼3ppmv indicating dry conditions even below the CPT altitude. The latitudinal variation of altitudes of the MTs and CPT showed quite different features. We also examined the role of equatorial waves in the occurrence of MTs. This wave mechanism could explain the MT occurrences that are in groups but not in the individual cases suggesting other mechanisms could also exist. ► Characteristics of the MTs over tropics and causative mechanisms presented. ► There is a marked latitudinal variation in MTs and CPT in different seasons. ► The SWVMR at LT is ∼3ppmv indicating dry conditions below the CPT. ► Wave mechanism could explain MTs that occur only in groups.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.jastp.2013.01.009</doi><tpages>9</tpages></addata></record>
fulltext fulltext
identifier ISSN: 1364-6826
ispartof Journal of atmospheric and solar-terrestrial physics, 2013-04, Vol.95-96, p.78-86
issn 1364-6826
1879-1824
language eng
recordid cdi_proquest_miscellaneous_1323807284
source Access via ScienceDirect (Elsevier)
subjects Cold point tropopause
COSMIC GPS RO and radiosonde
Equatorial planetary waves
Multiple tropopauses
title Characteristics of the multiple tropopauses in the tropics
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2024-12-17T19%3A37%3A17IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_cross&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Characteristics%20of%20the%20multiple%20tropopauses%20in%20the%20tropics&rft.jtitle=Journal%20of%20atmospheric%20and%20solar-terrestrial%20physics&rft.au=Mehta,%20Sanjay%20Kumar&rft.date=2013-04&rft.volume=95-96&rft.spage=78&rft.epage=86&rft.pages=78-86&rft.issn=1364-6826&rft.eissn=1879-1824&rft_id=info:doi/10.1016/j.jastp.2013.01.009&rft_dat=%3Cproquest_cross%3E1323807284%3C/proquest_cross%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1323807284&rft_id=info:pmid/&rft_els_id=S1364682613000333&rfr_iscdi=true