Extreme Convection at High Latitudes as Seen by GPM DPR › sites › default › files ›...
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Robert Houze 1,2 , Stacy Brodzik 1 , Jingyu Wang 2 , Jiwen Fan 2 1 University of Washington, 2 Pacific Northwest National Laboratory Background Objectives Extreme Convective Events seen by GPM DPR at High Latitudes Acknowledgments Discussion of Soundings PMM Science Team Meeting, Phoenix, AZ, 9 October 2018 Extreme Convection at High Latitudes as Seen by GPM DPR USGCRP, 2017: Climate Science Special Report: Fourth National Climate Assessment. doi: 10.7930/J0J964J6. Secondary bands Summary • GPM shows extreme convective events at high latitudes when temperatures are high. • IPCC shows global warming is greatest at high latitudes • Does this imply more extreme convection at high latitudes in the future? • •. 180°W 60°N DCC WCC DWC Definitions of extreme convective events •DCCDeep conv. core—3D echo >40dBZ & ≥10 km •WCCWide conv. core—3D echo >40dBZ & ≥ 1000 km 2 •DWCDeep wide core—3D echo object both deep & wide Extreme Convective Events (2014-2017) • Show that deep, intense, and wide convective systems occur at very high latitudes, where global warming is most pronounced • Illustrate the characteristic structures of intense convection at high latitudes • Determine the temperature, wind and moisture conditions associated with deep, intense, and wide convective systems at high latitudes DCC WCC DWC Near Surface Wind Rose All Events PMM Grant NNX16AD75G • Surface T in the 20’s (°C) • Specific Humidity often over 10 g/kg • CAPE mostly 1000-2500 J/kg • Surface winds mostly southerly 67°N • GPM shows that extreme convection (DCCs, WCCs, DWCs) occur frequently at latitudes north of 60° • Extreme convection occurs when it is very warm at high latitudes • Global warming at these latitudes suggests high latitude extreme convection will increase • The synoptic conditions favoring these events need to be studied
Transcript of Extreme Convection at High Latitudes as Seen by GPM DPR › sites › default › files ›...
Robert Houze1,2, Stacy Brodzik1, Jingyu Wang2, Jiwen Fan2 1University of Washington, 2Pacific Northwest National Laboratory
Background
Objectives
Extreme Convective Events seen by GPM DPR at High Latitudes
Acknowledgments
Discussion of Soundings
PMM Science Team Meeting, Phoenix, AZ, 9 October 2018
Extreme Convection at High Latitudes as Seen by GPM DPR
USGCRP, 2017: Climate Science Special Report: Fourth National Climate Assessment. doi: 10.7930/J0J964J6.
Secondary bands
Summary
• GPM shows extreme convective events at high latitudes when temperatures are high.
• IPCC shows global warming is greatest at high latitudes
• Does this imply more extreme convection at high latitudes in the future?
• • .
180°W 60°N
DCC WCC DWC
Definitions of extreme convective events • DCCàDeep conv. core—3D echo >40dBZ & ≥10 km • WCCàWide conv. core—3D echo >40dBZ & ≥ 1000 km2
• DWCàDeep wide core—3D echo object both deep & wide
Extreme Convective Events (2014-2017)
• Show that deep, intense, and wide convective systems occur at very high latitudes, where global warming is most pronounced
• Illustrate the characteristic structures of intense convection at high latitudes
• Determine the temperature, wind and moisture conditions associated with deep, intense, and wide convective systems at high latitudes
DCC
WCC
DWC
Near Surface Wind Rose All Events
PMM Grant NNX16AD75G
• Surface T in the 20’s (°C) • Specific Humidity often over 10 g/kg • CAPE mostly 1000-2500 J/kg • Surface winds mostly southerly
67°N
• GPM shows that extreme convection (DCCs, WCCs, DWCs) occur frequently at latitudes north of 60°
• Extreme convection occurs when it is very warm at high latitudes
• Global warming at these latitudes suggests high latitude extreme convection will increase
• The synoptic conditions favoring these events need to be studied
