Identification of systematic bias in the cross-platform (SMMR and SSM/I) EASE-Grid brightness temperature time series

Vertically polarized 18-, 19-, and 37-GHz brightness temperatures from the Scanning Multichannel Microwave Radiometer (SMMR) and Special Sensor Microwave/Imager (SSM/I) are examined for the August 2-20, 1987 period when data from both sensors are available in the Equal-Area Scalable Earth Grid (EASE-Grid) projection. Colocated measurements over terrestrial surfaces of central North America are compared because of a previously observed inconsistency in derived winter season snow water equivalent across the cross-platform passive microwave time series. The results of this comparison show that SSM/I brightness temperatures systematically exceed SMMR measurements, with the magnitude of this difference dependant on overpass time and brightness temperature magnitude. Regression relationships are determined for adjusting EASE-Grid SMMR data to an SSM/I F8 baseline and are compared to the results of a previous study that examined daily averaged data for the polar regions. These results suggest that adjustment factors are not globally applicable; rather the region and application must be considered.

[1]  Mary Jo Brodzik,et al.  Recent northern hemisphere snow extent: A comparison of data derived from visible and microwave satellite sensors , 2001 .

[2]  Dorothy K. Hall,et al.  Satellite sensor estimates of Northern Hemisphere snow volume , 1990 .

[3]  Fuzhong Weng,et al.  Physical retrieval of land surface temperature using the special sensor microwave imager , 1998 .

[4]  Mark R. Anderson,et al.  An improved method for determining snowmelt onset dates over Arctic sea ice using scanning multichannel microwave radiometer and Special Sensor Microwave/Imager data , 2001 .

[5]  Thomas J. Jackson,et al.  Soil moisture estimation using special satellite microwave/imager satellite data over a grassland region , 1997 .

[6]  Yann Kerr,et al.  Passive microwave remote sensing of land-atmosphere interactions , 1995 .

[7]  Chris Derksen,et al.  Combining SMMR and SSM/I Data for Time Series Analysis of Central North American Snow Water Equivalent , 2003 .

[8]  Cornelius W. Sullivan,et al.  Satellite microwave and in situ observations of the Weddell Sea ice cover and its marginal ice zone , 1986 .

[9]  Mark R. Anderson,et al.  Variations in snowpack melt on the Greenland ice sheet based on passive-microwave measurements , 1995, Journal of Glaciology.

[10]  Julienne C. Stroeve,et al.  An Intercomparison of DMSP F11- and F13-Derived Sea Ice Products , 1998 .

[11]  Kenneth C. Jezek,et al.  Comparison of SMMR and SSM/I passive microwave data collected over Antarctica , 1993 .

[12]  B. E. Goodison,et al.  Algorithm development for the estimation of snow water equivalent in the boreal forest using passive microwave data , 2003 .

[13]  Peter Bauer,et al.  Rainfall, total water, ice water, and water vapor over sea from polarized microwave simulations and Special Sensor Microwave/Imager data , 1993 .

[14]  Donald J. Cavalieri,et al.  Arctic and Antarctic Sea Ice, 1978-1987: Satellite Passive-Microwave Observations and Analysis , 1992 .

[15]  Mary Jo Brodzik,et al.  An earth-gridded SSM/I data set for cryospheric studies and global change monitoring , 1995 .

[16]  Donald J. Cavalieri,et al.  Passive microwave algorithms for sea ice concentration: A comparison of two techniques , 1997 .

[17]  Konrad Steffen,et al.  Comparison of brightness temperatures from SSMI instruments on the DMSP F8 and FII satellites for Antarctica and the Greenland ice sheet , 1995 .

[18]  Chris Derksen,et al.  Influence of Sensor Overpass Time on Passive Microwave-Derived Snow Cover Parameters , 2000 .

[19]  Ola M. Johannessen,et al.  Analysis of merged SMMR‐SSMI time series of Arctic and Antarctic sea ice parameters 1978–1995 , 1997 .