TY - JOUR
T1 - A modeling study of benthic detritus flux's impacts on heterotrophic processes in Lake Michigan
AU - Chen, Changsheng
AU - Wang, Lixia
AU - Qi, Jianhua
AU - Liu, Hedong
AU - Budd, Judith Wells
AU - Schwab, David J.
AU - Beletsky, Dmitry
AU - Vanderploeg, Henry
AU - Eadie, Brian
AU - Johengen, Thomas
AU - Cotner, James
AU - Lavrentyev, Peter J.
PY - 2004/10/15
Y1 - 2004/10/15
N2 - Effects of sediment resuspension-induced benthic detrital flux on the heterotrophic part of the microbial food web in Lake Michigan were examined using a three-dimensional (3-D) coupled biological and physical model. The model was driven by the realistic meteorological forcing observed in March 1999. Wind-induced surface wave dynamics were incorporated into the physical model to generate the bottom flux. The model-generated benthic detrital fiux was assumed to be proportional to the difference between model-calculated and critical stresses at the bottom. The model results indicate that detrital flux at the bottom was a key factor causing a significant increase of phosphorus and detritus concentrations in the nearshore region of the springtime plume. Inside the plume the sediment-resuspended bottom detritus flux could directly enhance heterotrophic production, while outside the plume, detrital flux from river discharge might have a direct contribution to the high abundance of bacteria and microzooplankton in the nearshore region. Mo&l-data comparison on cross-shore transects near Chicago, Gary, St. Joseph, and Racine suggests that other physical and biological processes may play a comparative role as the bottom detritus flux in terms of the spatial distribution of bacteria and microzoplankton. A more complete microbial food web model needs to be developed to simulate the hetereotrophic process in southern Lake Michigan.
AB - Effects of sediment resuspension-induced benthic detrital flux on the heterotrophic part of the microbial food web in Lake Michigan were examined using a three-dimensional (3-D) coupled biological and physical model. The model was driven by the realistic meteorological forcing observed in March 1999. Wind-induced surface wave dynamics were incorporated into the physical model to generate the bottom flux. The model-generated benthic detrital fiux was assumed to be proportional to the difference between model-calculated and critical stresses at the bottom. The model results indicate that detrital flux at the bottom was a key factor causing a significant increase of phosphorus and detritus concentrations in the nearshore region of the springtime plume. Inside the plume the sediment-resuspended bottom detritus flux could directly enhance heterotrophic production, while outside the plume, detrital flux from river discharge might have a direct contribution to the high abundance of bacteria and microzooplankton in the nearshore region. Mo&l-data comparison on cross-shore transects near Chicago, Gary, St. Joseph, and Racine suggests that other physical and biological processes may play a comparative role as the bottom detritus flux in terms of the spatial distribution of bacteria and microzoplankton. A more complete microbial food web model needs to be developed to simulate the hetereotrophic process in southern Lake Michigan.
KW - Coupled biological and physical model
KW - Microbial food web
KW - Pelagic coupling
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U2 - 10.1029/2002JC001689
DO - 10.1029/2002JC001689
M3 - Article
AN - SCOPUS:19944426071
VL - 109
SP - C10S11 1-13
JO - Journal of Geophysical Research A: Space Physics
JF - Journal of Geophysical Research A: Space Physics
SN - 2169-9380
IS - 10
ER -