Oct 31, 2008C. Grassotti Comparison of MIRS Sea Ice Concentration and Snow Water Equivalent Retrievals with AMSR-E Daily Products C. Grassotti, C. Kongoli, and S.-A. Boukabara

Oct 31, 2008C. Grassotti MIRS-AMSR Products Comparison Initial preliminary comparison with AMSR-E Level 3 Daily Products (SIC and SWE) on 20 October 2008 AMSR-E SIC: p.s. projection, 12.5 km resolution - 2 algorithms: NASA Team2, and Bootstrap - 3 products: Daily, Ascending, Descending AMSR-E SWE: Polar EASE projection, 25 km resolution Data remapped to common grid for intercomparison

Oct 31, 2008C. Grassotti Sea Ice Concentration

Oct 31, 2008C. Grassotti Sea Ice Concentration: MetopA vs. AMSR AMSRMIRS MIRS - AMSR Negative differences north of Siberia and Alaska (new or fy ice?)

Oct 31, 2008C. Grassotti Sea Ice Concentration: N18 vs. AMSR AMSRMIRS MIRS - AMSR Negative differences north of Siberia and Alaska (new or fy ice?)

Oct 31, 2008C. Grassotti Sea Ice Concentration: F16 vs. AMSR AMSRMIRS MIRS - AMSR Negative differences more extensive

Oct 31, 2008C. Grassotti AMSR SIC: NASA Team 2 vs. Bootstrap DailyAscending Descending NASA Team 2 much greater along ice edge

Oct 31, 2008C. Grassotti AMSR SIC: NASA Team 2 vs. Bootstrap DailyAscending Descending NASA Team 2 higher at ice edge, lower over thicker icepack

Oct 31, 2008C. Grassotti Snow Water Equivalent

Oct 31, 2008C. Grassotti Snow Water Equivalent: MetopA vs. AMSR AMSRMIRS MIRS - AMSR Snow covered areas agree approximately Little apparent bias, but large differences locally

Oct 31, 2008C. Grassotti Snow Water Equivalent: N18 vs. AMSR AMSRMIRS MIRS - AMSR Snow covered areas agree aproximately Little apparent bias, but large differences locally

Oct 31, 2008C. Grassotti Snow Water Equivalent: F16 vs. AMSR AMSRMIRS MIRS - AMSR Snow covered areas less than AMSR Large positive differences where both detect snow cover

Oct 31, 2008C. Grassotti Summary MIRS N18 and MetopA SIC and SWE retrievals in relatively good agreement with AMSR, and with each other (TBD: dependence on AMSR validation product, e.g. NASA Team 2 vs. Bootrap, seasonal dependence, etc.) AMSR: NASA Team 2 higher SIC vs. Bootstrap near ice edge MIRS F16 retrievals significant underestimation of SIC in NH MIRS F16 SWE retrievals problematic: undetected AMSR snow-covered areas and overestimation in areas where both agree F16 issues: Emissivity catalogs different for F16 vs. Metop and NOAA (scanning and polarization differences). Suggests use of spectral gradients rather than absolute magnitudes? Resolution a high priority. AMSR products not absolute validation, but good first step toward independent assessment