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Hossein

Hossein Hashemi

Senior lecturer

Hossein

High-resolution Monthly Satellite Precipitation Product over the Conterminous United States

Author

  • Hossein Hashemi
  • Jessica Fayne
  • Rosemary Knight
  • Venkat Lakshmi

Summary, in English

We present a data set that enhanced the Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Analysis (TMPA) monthly product 3B43 in its accuracy and spatial resolution. For this, we developed a correction function to improve the accuracy of TRMM 3B43, spatial resolution of ~25 km, by estimating and removing the bias in the satellite data using a ground-based precipitation data set. We observed a strong relationship between the bias and land surface elevation; TRMM 3B43 tends to underestimate the ground-based product at elevations above 1500 m above mean sea level (m.amsl) over the conterminous United States. A relationship was developed between satellite bias and elevation.
We then resampled TRMM 3B43 to the Digital Elevation Model (DEM) data set at a spatial resolution of 30 arc second (~1 km on the ground). The produced high-resolution satellite-based data set was corrected using the developed correction function based on the bias-elevation relationship. Assuming that each rain gauge represents an area of ~1 km2, we verified our product against 9,200 rain gauges across the conterminous United States. The new product was compared with the gauges, which have 50, 60, 70, 80, 90, and 100% temporal coverage within the TRMM period of 1998 to 2015. Comparisons between the high-resolution corrected satellite-based data and gauges showed an excellent agreement. The new product captured more detail in the changes in precipitation over the mountainous region than the original TRMM 3B43.

Department/s

  • Centre for Advanced Middle Eastern Studies
  • Division of Water Resources Engineering
  • MECW: The Middle East in the Contemporary World

Publishing year

2017-12-12

Language

English

Document type

Poster

Topic

  • Engineering and Technology

Keywords

  • TRMM TMPA
  • High resolution
  • CONUS

Conference name

AGU (American Geophysical Union) Fall Meeting, 2017

Conference date

2017-12-11 - 2017-12-15

Conference place

New Orleans, United States

Status

Published