Lake sediments

Fluctuations in the water balance (precipitation minus evaporation: P-E) over the catchment of a lake are reflected in changes in lake area, level and volume, and can thus be reconstructed from geomorphic and stratigraphic records from the lake basin (Street-Perrott et al., 1989). Although such changes may be influenced by local non-climatic factors, regional-synchronous changes in lake area, level or volume (collectively referred to as lake status) are generally a response to climate. Thus, regional changes in lake status have been used to reconstruct regional palaeoclimates and the changes in atmospheric circulation patterns that gave rise to them (Harrison et al., 1996). Continental-scale reconstructions of changes in lake status have also been used as a benchmark to evaluate model simulations of changes in P-E (e.g. COHMAP, 1988; Qin et al., 1998).

The Global Lake Status Data Base (GLSDB: Qin et al., 1998) is an effort to compile the geomorphic and biostratigraphic data for changes in lake status for individual lake basins, in order to document changes in regional water balance during the last 40,000 years. The Chinese Lake Status Data Base (CLSDB: Yu et al., 2001a, 2001b) is a component of the GLSDB. Version 1 of the CLSDB contains 42 lakes (Yu et al., 2001a) and a further 26 lakes are included in an updated version of the data set (Yu et al., 2001b).

0 0

Post a comment