An orographically adjusted GPM precipitation retrieval for NOAA’s QPE over mountainous terrain Dan Bikos, Edward Szoke, Steven Miller, Stanley Kidder,

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Presentation transcript:

An orographically adjusted GPM precipitation retrieval for NOAA’s QPE over mountainous terrain Dan Bikos, Edward Szoke, Steven Miller, Stanley Kidder, Christian Kummerow, Cindy Combs, Scott Longmore * Paula Brown Cooperative Institute for Research in the Atmosphere (CIRA) * Department of Atmospheric Science Colorado State University, Fort Collins, CO Abstract: The core satellite of the Global Precipitation Mission (GPM) was successfully launched on February 28, Designed as a baseline for the inter-calibration of various passive microwave sensors comprising the GPM constellation (including SSMI/S, AMSR-E, and MHS), this core satellite carries a dual frequency precipitation radar [DPR; Ku band (13.6 GHz) and Ka band (35.5 GHz)] and state-of-the art GPM microwave imager [GMI; multiple bands in the 10 – 183 GHz spectrum]. The full complement of the GPM constellation enables a global precipitation product having roughly 10 km spatial resolution on 3-hourly intervals that approaches the scales needed for hydrologic applications. One of the limitations of the GPM precipitation products is an underestimation of precipitation rate over orography due to mechanical lifting of water vapor that leads to substantial precipitation without a commensurate increase in the ice phase. To address this underestimation, the Orographic Rain Index (ORI) product is investigated to determine if ORI can enhance GMI precipitation estimates over orography. Objectives: Compare the GMI to the DPR estimates of precipitation rates (with the DPR serving as “ground truth”). This highlights where GMI retrievals have limitations (presumed to be over orography) Compare the distribution of ORI to GMI, both subjectively and quantitatively through a comparison at similar points. Hypothesis: ORI should be able to use GMI estimates to result in a more accurate precipitation estimate over orography. 12 December 2014 case: CIRA Blended TPW (bTPW) 2245 UTC 11 Dec UTC 12 Dec 2014 CIRA bTPW product depicts significant Atmospheric River event. Widespread (5”+) rainfall coastal / inland California. GOES IR at 1445 UTC 12 Dec 2014GOES IR at 2230 UTC 11 Dec 2014 Region of GPM pass obscured by warm conveyor belt cloud cover. Cloud cover likely associated with orographic precipitation ahead of warm conveybor belt / frontal band. GPM/DPR pass at 15Z 12 December Sectors over land on left. Northern sector (foothills of Sierra Nevadas in the northeast corner) Land based radar (NMQ) does not capture the full extent of the higher precipitation rates in proximity to the ascending topography compared to DPR. GMI has even lesser precipitation rates, indicating the potential for ORI to identify (and enhance) this region of orographic precipitation. Southern sector (coastal mountain ranges) Area of convective rainfall. GMI in better agreement with DPR / NMQ Topographic map with boxes as shown on left 7 February 2015 case: GPM/DPR pass at 15Z 7 February Boxes correspond to scatter plots on right. GPM/GMI pass at 15Z 7 February ORI at 15Z 7 February Red oval highlights higher ORI values in the coastal mountain range in the northernmost box to the left.