GSTDTAP  > 地球科学
DOI10.5194/acp-17-6113-2017
Enhanced stratospheric water vapor over the summertime continental United States and the role of overshooting convection
Herman, Robert L.1; Ray, Eric A.2; Rosenlof, Karen H.2; Bedka, Kristopher M.3; Schwartz, Michael J.1; Read, William G.1; Troy, Robert F.1; Chin, Keith1; Christensen, Lance E.1; Fu, Dejian1; Stachnik, Robert A.1; Bui, T. Paul4; Dean-Day, Jonathan M.5
2017-05-17
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2017
卷号17期号:9
文章类型Article
语种英语
国家USA
英文摘要

The NASA ER-2 aircraft sampled the lower stratosphere over North America during the field mission for the NASA Studies of Emissions and Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC(4)RS). This study reports observations of convectively influenced air parcels with enhanced water vapor in the overworld stratosphere over the summertime continental United States and investigates three case studies in detail. Water vapor mixing ratios greater than 10 ppmv, which is much higher than the background 4 to 6 ppmv of the overworld stratosphere, were measured by the JPL Laser Hygrometer (JLH Mark2) at altitudes between 16.0 and 17.5 km (potential temperatures of approximately 380 to 410 K). Overshooting cloud tops (OTs) are identified from a SEAC(4)RS OT detection product based on satellite infrared window channel brightness temperature gradients. Through trajectory analysis, we make the connection between these in situ water measurements and OT. Back trajectory analysis ties enhanced water to OT 1 to 7 days prior to the intercept by the aircraft. The trajectory paths are dominated by the North American monsoon (NAM) anticyclonic circulation. This connection suggests that ice is convectively transported to the overworld stratosphere in OT events and subsequently sublimated; such events may irreversibly enhance stratospheric water vapor in the summer over Mexico and the United States. A regional context is provided by water observations from the Aura Microwave Limb Sounder (MLS).


领域地球科学
收录类别SCI-E
WOS记录号WOS:000401476300001
WOS关键词TROPICAL TROPOPAUSE ; CLIMATE ; PLUMES ; DEHYDRATION ; VARIABILITY ; TRANSPORT ; CLOUDS ; SYSTEM ; DEEP
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/24994
专题地球科学
作者单位1.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91125 USA;
2.NOAA, ESRL, Chem Sci Div, Boulder, CO USA;
3.NASA, Langley Res Ctr, Hampton, VA 23665 USA;
4.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA;
5.Bay Area Environm Res Inst, Sonoma, CA USA
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Herman, Robert L.,Ray, Eric A.,Rosenlof, Karen H.,et al. Enhanced stratospheric water vapor over the summertime continental United States and the role of overshooting convection[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(9).
APA Herman, Robert L..,Ray, Eric A..,Rosenlof, Karen H..,Bedka, Kristopher M..,Schwartz, Michael J..,...&Dean-Day, Jonathan M..(2017).Enhanced stratospheric water vapor over the summertime continental United States and the role of overshooting convection.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(9).
MLA Herman, Robert L.,et al."Enhanced stratospheric water vapor over the summertime continental United States and the role of overshooting convection".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.9(2017).
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