Premium
Variability of coloured dissolved organic carbon in seepage humic lakes as related to lake morphometry, catchment characteristics and precipitation.
Author(s) -
Pęczuła Wojciech
Publication year - 2015
Publication title -
ecohydrology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.982
H-Index - 54
eISSN - 1936-0592
pISSN - 1936-0584
DOI - 10.1002/eco.1577
Subject(s) - drainage basin , environmental science , precipitation , hydrology (agriculture) , total organic carbon , dissolved organic carbon , physical geography , geology , environmental chemistry , oceanography , chemistry , geography , cartography , geotechnical engineering , meteorology
The variability of coloured dissolved organic carbon (CDOC) in ten seepage and humic lakes was studied in an attempt to find out whether the morphometry of lake bodies and their catchment characteristics influence the studied factor during the ice‐free season. The study was carried out in two consecutive years differed with annual sum of precipitation. Using an absorption coefficient at 320 nm as a proxy of CDOC content, and a coefficient of variation as a measure of its variability, we correlated these to lake and catchment features. The results showed that out of 11 studied characteristics, two (maximum and mean depth of the lake) were negatively correlated (−0.85 and −0.78, P < 0.01) and three (catchment size, drainage ratio and Schindler ratio) were positively correlated (0.64, 0.73, P < 0.05; 0.86, P < 0.01) to the studied variable. We have hence concluded that: (1) in more shallow lakes with greater catchment size, more intense mechanism of DOC loss exist during the summer, in contrast to deeper lakes with thermal stratification; (2) precipitation has a strong influence on CDOC inter‐annual and seasonal variability, particularly in shallow lakes with high forest cover in their catchments. Copyright © 2014 John Wiley & Sons, Ltd.