Skip to Main content Skip to Navigation
Journal articles

Wetland seasonal dynamics and interannual variability over northern high latitudes, derived from microwave satellite data

Abstract : A new accurate determination of the spatial and temporal variations of northern wetland area extent, during the snow-free period, is retrieved from the 19- and 37-GHz passive microwave Special Sensor Microwave/Imager (SSM/I) brightness temperature database. The total fraction of water surface (FWS) area, corresponding to small lakes or reservoirs (area < 25 × 25 km2), inundated surfaces and natural wetland areas, computed on a weekly basis and averaged over the 1988–2001 period, gives a maximum summer extent of 10.10 ± 0.21 × 105 km2 for Canada and Alaska and 12.7 ± 0.35 × 105 km2 for Eurasia, above 50°N. The mean seasonal dynamics of wetland and inundated surfaces shows a maximum area extent during the months of July-August-September over North America (48°N–68°N) and between June and September over northern Eurasia. The interannual variations of the yearly total FWS area since 1988 show a slight increase (8% ± 3%) in Canada-Alaska, mainly due to a decrease in the snow cover extent. The FWS interannual variability in the Ob River basin, which is well explained by the water discharge variations, shows an increase of 8.5% ± 1.5% between 1988 and 2001. The microwave-derived FWS estimate and its dynamics present an interesting potential for studying the climate-driven variability of wetlands and inundated areas.
Document type :
Journal articles
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-00374874
Contributor : Aurore Gayraud <>
Submitted on : Friday, April 10, 2009 - 10:06:25 AM
Last modification on : Wednesday, October 14, 2020 - 3:58:50 AM

Links full text

Identifiers

Collections

Citation

Arnaud Mialon, A. Royer, Michel Fily. Wetland seasonal dynamics and interannual variability over northern high latitudes, derived from microwave satellite data. Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2005, 110 (D17102), 1 à 10 p. ⟨10.1029/2004JD005697⟩. ⟨insu-00374874⟩

Share

Metrics

Record views

258