vinu
30th July 2007, 05:16 AM
To: Paleoclimatology, Paleoceanography and Ocean Biogeochemistry
Community
From: Figen Mekik
Please submit abstracts to the session on deep sea carbonate dissolution
at the fall meeting of AGU in beautiful San Francisco. This is a
Paleoclimatology and Paloceanography session and was numbered PP02 in
the original list of session proposals. Go to
http://www.agu.org/meetings/fm07/ for the most recent program listing
and the abstract submission tool. All abtracts are due September 6. The
formal session description follows but, in a nutshell, we welcome
abstracts about all aspects of calcite dissolution in the oceans
including but not limited to the effect of ocean acidification on marine
calcifiers, specific proxies for traciing dissolution, biogeochemical
modeling, and the kinetics of calcite dissolution (to name just a few).
Session Title: Carbonate Dissolution in Deep Sea Sediments: Proxies,
Models and Applications both in the Modern Ocean and in the Paleo-Record
Conveners: Figen Mekik, Paul Loubere and Roger Francois
Session Description:
Quantifying carbonate dissolution in deep sea sediments has been a
long-standing oceanographic problem dating back to the Challenger
Expedition (1872-1876) and it is still unresolved. However a reliable
and quantitative dissolution proxy is crucial for many applications such
as (1) measuring the strength of the biological pump by estimating
calcite fluxes to the deep sea in both modern and down core sediments,
(2) detecting and documenting changes in the ratio of organic carbon to
calcite flux at the seabed (rain ratio), again both in core tops and in
the paleo-record, (3) quantifying the degree and rate with which deep
marine carbonates can buffer atmospheric pCO2 especially since we are
living in a time of human-induced global warming whose repercussions are
difficult to pin down; (4) documenting and understanding the rates and
dynamics of prior incidences of massive carbonate dissolution in
response to prolonged global warming episodes in the Earth’s geologic
past, like the Paleocene-Eocene Thermal Maximum (PETM), and (5) the
evolution of the carbon cycle over geological time.
Many proxies have been developed through the years from planktic to
benthic foraminifer ratios in sediments to more recent ones, like, (1)
size normalized foraminifer shell weight, (2) sediment size index, (3)
whole assemblage foraminifer fragmentation, (4) species-specific
fragmentation, and even geochemical proxies like Mg/Ca in planktonic
foraminifers. Furthermore, some proxies are known to detect the
carbonate ion under-saturation of bottom waters, like Zn/Ca from benthic
foraminifers.
We welcome all contributions involving proxy calibration, application
and modeling of deep sea calcite dissolution and calcite production in
modern sediments and throughout the geologic record.
Figen Mekik
Associate Professor
Grand Valley State University
Department of Geology
Allendale, MI 49401
(616) 331 3020
http://www4.gvsu.edu/mekikf/
fax (616) 331 3740
Community
From: Figen Mekik
Please submit abstracts to the session on deep sea carbonate dissolution
at the fall meeting of AGU in beautiful San Francisco. This is a
Paleoclimatology and Paloceanography session and was numbered PP02 in
the original list of session proposals. Go to
http://www.agu.org/meetings/fm07/ for the most recent program listing
and the abstract submission tool. All abtracts are due September 6. The
formal session description follows but, in a nutshell, we welcome
abstracts about all aspects of calcite dissolution in the oceans
including but not limited to the effect of ocean acidification on marine
calcifiers, specific proxies for traciing dissolution, biogeochemical
modeling, and the kinetics of calcite dissolution (to name just a few).
Session Title: Carbonate Dissolution in Deep Sea Sediments: Proxies,
Models and Applications both in the Modern Ocean and in the Paleo-Record
Conveners: Figen Mekik, Paul Loubere and Roger Francois
Session Description:
Quantifying carbonate dissolution in deep sea sediments has been a
long-standing oceanographic problem dating back to the Challenger
Expedition (1872-1876) and it is still unresolved. However a reliable
and quantitative dissolution proxy is crucial for many applications such
as (1) measuring the strength of the biological pump by estimating
calcite fluxes to the deep sea in both modern and down core sediments,
(2) detecting and documenting changes in the ratio of organic carbon to
calcite flux at the seabed (rain ratio), again both in core tops and in
the paleo-record, (3) quantifying the degree and rate with which deep
marine carbonates can buffer atmospheric pCO2 especially since we are
living in a time of human-induced global warming whose repercussions are
difficult to pin down; (4) documenting and understanding the rates and
dynamics of prior incidences of massive carbonate dissolution in
response to prolonged global warming episodes in the Earth’s geologic
past, like the Paleocene-Eocene Thermal Maximum (PETM), and (5) the
evolution of the carbon cycle over geological time.
Many proxies have been developed through the years from planktic to
benthic foraminifer ratios in sediments to more recent ones, like, (1)
size normalized foraminifer shell weight, (2) sediment size index, (3)
whole assemblage foraminifer fragmentation, (4) species-specific
fragmentation, and even geochemical proxies like Mg/Ca in planktonic
foraminifers. Furthermore, some proxies are known to detect the
carbonate ion under-saturation of bottom waters, like Zn/Ca from benthic
foraminifers.
We welcome all contributions involving proxy calibration, application
and modeling of deep sea calcite dissolution and calcite production in
modern sediments and throughout the geologic record.
Figen Mekik
Associate Professor
Grand Valley State University
Department of Geology
Allendale, MI 49401
(616) 331 3020
http://www4.gvsu.edu/mekikf/
fax (616) 331 3740