Observed Evolution of Northward-Propagating Intraseasonal Variation over the Western Pacific: A Case Study in Boreal Early Summer
This report describes the in situ observed evolution of the atmospheric profile during an event of the boreal summer intraseasonal variation (BSISV) in the tropical western Pacific Ocean. The convectively active region of the BSISV proceeded northward over the sounding and radar network. Over the ar...
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| Veröffentlicht in: | Monthly weather review 2013-02, Vol.141 (2), p.690-706 |
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| creator | KATSUMATA, Masaki YAMADA, Hiroyuki KUBOTA, Hisayuki MOTEKI, Qoosaku SHIROOKA, Ryuichi |
| description | This report describes the in situ observed evolution of the atmospheric profile during an event of the boreal summer intraseasonal variation (BSISV) in the tropical western Pacific Ocean. The convectively active region of the BSISV proceeded northward over the sounding and radar network. Over the array, the situation changed from a convectively inactive period to an active period. Inspection of the sounding data revealed the gradual moistening of the lower troposphere during the convectively inactive period. The sounding-derived heat and moisture budget analyses indicated that both the convective- and large-scale processes caused moistening of the lower and middle troposphere where the radar echo tops were observed most frequently. This study is the first to identify such a "preconditioning" process for the BSISV in the western Pacific using detailed in situ observational data. During the preconditioning, an increase in CAPE was observed, as in previous studies of the MJO. An increase of moisture in the boundary layer was responsible for the increase of CAPE. The large-scale horizontal convergence in the boundary layer may be a key factor to moisten the boundary layer through the convective-scale processes, as well as through the large-scale processes to moisten the lower and middle troposphere. |
| doi_str_mv | 10.1175/mwr-d-12-00011.1 |
| format | Article |
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The convectively active region of the BSISV proceeded northward over the sounding and radar network. Over the array, the situation changed from a convectively inactive period to an active period. Inspection of the sounding data revealed the gradual moistening of the lower troposphere during the convectively inactive period. The sounding-derived heat and moisture budget analyses indicated that both the convective- and large-scale processes caused moistening of the lower and middle troposphere where the radar echo tops were observed most frequently. This study is the first to identify such a "preconditioning" process for the BSISV in the western Pacific using detailed in situ observational data. During the preconditioning, an increase in CAPE was observed, as in previous studies of the MJO. An increase of moisture in the boundary layer was responsible for the increase of CAPE. The large-scale horizontal convergence in the boundary layer may be a key factor to moisten the boundary layer through the convective-scale processes, as well as through the large-scale processes to moisten the lower and middle troposphere.</description><identifier>ISSN: 0027-0644</identifier><identifier>EISSN: 1520-0493</identifier><identifier>DOI: 10.1175/mwr-d-12-00011.1</identifier><identifier>CODEN: MWREAB</identifier><language>eng</language><publisher>Boston, MA: American Meteorological Society</publisher><subject>Atmosphere ; Atmospheric evolution ; Boundary layer ; Boundary layers ; Budgets ; Convection, turbulence, diffusion. Boundary layer structure and dynamics ; Earth, ocean, space ; Echo sounding ; Evolution ; Exact sciences and technology ; External geophysics ; Hypotheses ; Inspection ; Intraseasonal variations ; Lower troposphere ; Meteorology ; Middle troposphere ; Moisture ; Moisture budget ; Preconditioning ; Propagation ; Radar ; Radar arrays ; Radar clutter ; Radar data ; Radar echoes ; Radar networks ; Remote sensing systems ; Sounding ; Soundings ; Studies ; Summer ; Troposphere ; Wetting</subject><ispartof>Monthly weather review, 2013-02, Vol.141 (2), p.690-706</ispartof><rights>2014 INIST-CNRS</rights><rights>Copyright American Meteorological Society Feb 2013</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c475t-f4f733d7472d2156e195dd4a5e5d1642f6036c1f4330b778a601ef3a14a5733f3</citedby><cites>FETCH-LOGICAL-c475t-f4f733d7472d2156e195dd4a5e5d1642f6036c1f4330b778a601ef3a14a5733f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,3679,27923,27924</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=27136299$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>KATSUMATA, Masaki</creatorcontrib><creatorcontrib>YAMADA, Hiroyuki</creatorcontrib><creatorcontrib>KUBOTA, Hisayuki</creatorcontrib><creatorcontrib>MOTEKI, Qoosaku</creatorcontrib><creatorcontrib>SHIROOKA, Ryuichi</creatorcontrib><title>Observed Evolution of Northward-Propagating Intraseasonal Variation over the Western Pacific: A Case Study in Boreal Early Summer</title><title>Monthly weather review</title><description>This report describes the in situ observed evolution of the atmospheric profile during an event of the boreal summer intraseasonal variation (BSISV) in the tropical western Pacific Ocean. The convectively active region of the BSISV proceeded northward over the sounding and radar network. Over the array, the situation changed from a convectively inactive period to an active period. Inspection of the sounding data revealed the gradual moistening of the lower troposphere during the convectively inactive period. The sounding-derived heat and moisture budget analyses indicated that both the convective- and large-scale processes caused moistening of the lower and middle troposphere where the radar echo tops were observed most frequently. This study is the first to identify such a "preconditioning" process for the BSISV in the western Pacific using detailed in situ observational data. During the preconditioning, an increase in CAPE was observed, as in previous studies of the MJO. An increase of moisture in the boundary layer was responsible for the increase of CAPE. 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Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Military Database</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Research Library (Corporate)</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Environmental Science Database</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Environmental Science Collection</collection><collection>ProQuest Central Basic</collection><collection>SIRS Editorial</collection><jtitle>Monthly weather review</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>KATSUMATA, Masaki</au><au>YAMADA, Hiroyuki</au><au>KUBOTA, Hisayuki</au><au>MOTEKI, Qoosaku</au><au>SHIROOKA, Ryuichi</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Observed Evolution of Northward-Propagating Intraseasonal Variation over the Western Pacific: A Case Study in Boreal Early Summer</atitle><jtitle>Monthly weather review</jtitle><date>2013-02-01</date><risdate>2013</risdate><volume>141</volume><issue>2</issue><spage>690</spage><epage>706</epage><pages>690-706</pages><issn>0027-0644</issn><eissn>1520-0493</eissn><coden>MWREAB</coden><abstract>This report describes the in situ observed evolution of the atmospheric profile during an event of the boreal summer intraseasonal variation (BSISV) in the tropical western Pacific Ocean. The convectively active region of the BSISV proceeded northward over the sounding and radar network. Over the array, the situation changed from a convectively inactive period to an active period. Inspection of the sounding data revealed the gradual moistening of the lower troposphere during the convectively inactive period. The sounding-derived heat and moisture budget analyses indicated that both the convective- and large-scale processes caused moistening of the lower and middle troposphere where the radar echo tops were observed most frequently. This study is the first to identify such a "preconditioning" process for the BSISV in the western Pacific using detailed in situ observational data. During the preconditioning, an increase in CAPE was observed, as in previous studies of the MJO. An increase of moisture in the boundary layer was responsible for the increase of CAPE. The large-scale horizontal convergence in the boundary layer may be a key factor to moisten the boundary layer through the convective-scale processes, as well as through the large-scale processes to moisten the lower and middle troposphere.</abstract><cop>Boston, MA</cop><pub>American Meteorological Society</pub><doi>10.1175/mwr-d-12-00011.1</doi><tpages>17</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Monthly weather review, 2013-02, Vol.141 (2), p.690-706 |
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| subjects | Atmosphere Atmospheric evolution Boundary layer Boundary layers Budgets Convection, turbulence, diffusion. Boundary layer structure and dynamics Earth, ocean, space Echo sounding Evolution Exact sciences and technology External geophysics Hypotheses Inspection Intraseasonal variations Lower troposphere Meteorology Middle troposphere Moisture Moisture budget Preconditioning Propagation Radar Radar arrays Radar clutter Radar data Radar echoes Radar networks Remote sensing systems Sounding Soundings Studies Summer Troposphere Wetting |
| title | Observed Evolution of Northward-Propagating Intraseasonal Variation over the Western Pacific: A Case Study in Boreal Early Summer |
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