DOI: 10.1175/JCLI-D-12-00034.1
Scopus记录号: 2-s2.0-84874840000
论文题名: Identifying the MJO, equatorial waves, and their impacts using 32 years of HIRS upper-tropospheric water vapor
作者: Schreck C.J. ; Shi L. ; Kossin J.P. ; Bates J.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 4 起始页码: 1418
结束页码: 1431
语种: 英语
Scopus关键词: Climate data records
; Equatorial Rossby waves
; Extra-tropical Rossby waves
; High resolution infrared radiation sounders
; Horizontal advection
; Madden-Julian oscillation
; North Pacific Ocean
; Outgoing longwave radiation
; Coastal zones
; Infrared radiation
; Ocean currents
; Spectrum analysis
; Subsidence
; Troposphere
; Vapors
; Tropics
; equatorial wave
; Kelvin wave
; Madden-Julian oscillation
; Rossby wave
; spectral analysis
; troposphere
; water vapor
; North America
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: The Madden-Julian oscillation (MJO) and convectively coupled equatorial waves are the dominant modes of synoptic-to-subseasonal variability in the tropics. These systems have frequently been examined with proxies for convection such as outgoing longwave radiation (OLR). However, upper-tropospheric water vapor (UTWV) gives a more complete picture of tropical circulations because it is more sensitive to the drying and warming associated with subsidence. Previous studies examined tropical variability using relatively short (3-7 yr) UTWV datasets. Intersatellite calibration of data from the High Resolution Infrared Radiation Sounder (HIRS) has recently produced a homogeneous 32-yr climate data record ofUTWVfor 200-500 hPa. This study explores the utility of HIRS UTWV for identifying the MJO and equatorial waves. Spectral analysis shows that the MJO and equatorial waves stand out above the low-frequency background in UTWV, similar to previous findings with OLR. The fraction of variance associated with the MJO and equatorial Rossby waves is actually greater in UTWV than in OLR. Kelvin waves, on the other hand, are overshadowed in UTWV by horizontal advection from extratropical Rossby waves. For the MJO, UTWV identifies subsidence drying in the subtropics, poleward of the convection. These dry anomalies are associated with the MJO's subtropical Rossby gyres. MJO events with dry anomalies over the central North Pacific Ocean also amplify the 200-hPa flow pattern over North America 7 days later. These events cannot be identified using equatorial OLR alone, which demonstrates that UTWV is a useful supplement for identifying the MJO, equatorial waves. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52015
Appears in Collections: 气候变化事实与影响
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作者单位: Cooperative Institute for Climate and Satellites (CICS-NC), North Carolina State University, Asheville, NC, United States; NOAA, National Climatic Data Center, Asheville, NC, United States; NOAA Cooperative Institute for Meteorological Satellite Studies, Madison, WI, United States
Recommended Citation:
Schreck C.J.,Shi L.,Kossin J.P.,et al. Identifying the MJO, equatorial waves, and their impacts using 32 years of HIRS upper-tropospheric water vapor[J]. Journal of Climate,2013-01-01,26(4)