AbstractUsing a database of extratropical cyclone locations, and cyclone-centered compositing, the distribution of precipitation frequency and rate in oceanic extratropical cyclones is analyzed using satellite-derived datasets. The distribution of precipitation rates retrieved using two new datasets, the Global Precipitation Measurement (GPM) radar-microwave radiometer combined (GPM-CMB) and the Integrated Multi-satellitE Retrievals for GPM (IMERG) products, are compared to CloudSat and the differences are discussed. For reference, the composites of AMSR-E, GPCP and two reanalyses are also examined. Cyclone-centered precipitation rates are found to be the largest with the IMERG and CloudSat datasets and lowest with GPM-CMB. A series of tests are conducted to determine the role of swath width and location, and sampling frequency, season and epoch. In all cases, these impacts are less than ~0.14 mm/hr at 50 km resolution. Larger differences in the composites are related to retrieval biases, such as ground-clutter contamination in GPM-CMB and radar saturation in CloudSat. Overall the IMERG product reports precipitation more often, with larger precipitation rates at the center of the cyclones, in high precipitable water (PW) conditions. The CloudSat product tends to report more precipitation in dry or moderate PW conditions. The GPM-CMB product tends to systematically report lower precipitation rates than the other two datasets. This inter-comparison comparison provides: (a) modelers with an observational uncertainty and range (0.21 to 0.36 mm/hr near the cyclone centers) when using composites of precipitation for model evaluation, and (b) retrieval algorithm developers with categorical analysis of the sensitivity of the products to PW.
Journal of Applied Meteorology and Climatology – American Meteorological Society
Published: Mar 6, 2018
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