Meeting:Abstract 2013 CSDMS meeting-011: Difference between revisions
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|CSDMS meeting abstract title= | |CSDMS meeting abstract title=Combining Observations and Numerical Model Results to Improve Estimates of Hypoxic Volume Within the Chesapeake Bay | ||
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|CSDMS meeting coauthor first name abstract=Aaron | |||
|CSDMS meeting coauthor last name abstract=Bever | |||
|CSDMS meeting coauthor institute / Organization=Delta Modeling Associates, Inc. | |||
|CSDMS meeting coauthor town-city=San Francisco | |||
|CSDMS meeting coauthor country=United States | |||
|State=California | |||
|CSDMS meeting coauthor email address=aaron@deltamodeling.com | |||
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|CSDMS meeting coauthor first name abstract=Marjy | |||
|CSDMS meeting coauthor last name abstract=Friedrichs | |||
|CSDMS meeting coauthor institute / Organization=Virginia Institute of Marine Science | |||
|CSDMS meeting coauthor town-city=Gloucester Point | |||
|CSDMS meeting coauthor country=United States | |||
|State=Virginia | |||
|CSDMS meeting coauthor email address=marjy@vims.edu | |||
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|CSDMS meeting coauthor first name abstract=Malcolm | |||
|CSDMS meeting coauthor last name abstract=Scully | |||
|CSDMS meeting coauthor institute / Organization=Woods Hole Oceanographic Institution | |||
|CSDMS meeting coauthor town-city=Woods Hole | |||
|CSDMS meeting coauthor country=United States | |||
|State=Massachusetts | |||
|CSDMS meeting coauthor email address=mscully@whoi.edu | |||
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{{CSDMS meeting abstract template | {{CSDMS meeting abstract template | ||
|CSDMS meeting abstract= | |CSDMS meeting abstract=The overall size of the Chesapeake Bay “dead zone” is quantified by the Bay’s hypoxic volume (HV), i.e., the volume of water with dissolved oxygen (DO) less than 2 mg/L. In order to improve estimates of HV, DO was subsampled from the output of three dimensional model hindcasts at times/locations matching the set of 2004-2005 stations monitored by the Chesapeake Bay Program. The resulting station profiles were then input into an interpolation program to produce Bay-wide estimates of HV in a manner consistent with non-synoptic, cruise-based estimates. Interpolations of the same stations sampled synoptically as well as multiple other combinations of station profiles were examined in order to quantify uncertainties associated with interpolating HV from observed profiles. The potential uncertainty in summer HV estimates resulting from profiles being collected over two weeks rather than synoptically, averaged ~5 km^3. This is larger than that due to sampling at discrete stations and interpolating/extrapolating to the entire Bay (2.4 km^3 ). As a result, sampling fewer, selected stations over a shorter time period is likely to reduce uncertainties associated with interpolating HV from observed profiles. A function was also derived, that, when applied to a subset of 13 stations, significantly improved estimates of HV. Finally, multiple metrics for quantifying Bay wide hypoxia were examined, and cumulative hypoxic volume was determined to be particularly useful, as a result of its insensitivity to temporal errors and climate change. A final product of this analysis is a nearly three-decade time series of improved estimates of HV for Chesapeake Bay. (Submitted March 2013 to Journal of Geophysical Research. For a pdf pre-print contact Carl Friedrichs at cfried@vims.edu .) | ||
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Latest revision as of 15:12, 10 June 2017
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Combining Observations and Numerical Model Results to Improve Estimates of Hypoxic Volume Within the Chesapeake Bay
[[Image:|300px|right|link=File:]]The overall size of the Chesapeake Bay “dead zone” is quantified by the Bay’s hypoxic volume (HV), i.e., the volume of water with dissolved oxygen (DO) less than 2 mg/L. In order to improve estimates of HV, DO was subsampled from the output of three dimensional model hindcasts at times/locations matching the set of 2004-2005 stations monitored by the Chesapeake Bay Program. The resulting station profiles were then input into an interpolation program to produce Bay-wide estimates of HV in a manner consistent with non-synoptic, cruise-based estimates. Interpolations of the same stations sampled synoptically as well as multiple other combinations of station profiles were examined in order to quantify uncertainties associated with interpolating HV from observed profiles. The potential uncertainty in summer HV estimates resulting from profiles being collected over two weeks rather than synoptically, averaged ~5 km^3. This is larger than that due to sampling at discrete stations and interpolating/extrapolating to the entire Bay (2.4 km^3 ). As a result, sampling fewer, selected stations over a shorter time period is likely to reduce uncertainties associated with interpolating HV from observed profiles. A function was also derived, that, when applied to a subset of 13 stations, significantly improved estimates of HV. Finally, multiple metrics for quantifying Bay wide hypoxia were examined, and cumulative hypoxic volume was determined to be particularly useful, as a result of its insensitivity to temporal errors and climate change. A final product of this analysis is a nearly three-decade time series of improved estimates of HV for Chesapeake Bay. (Submitted March 2013 to Journal of Geophysical Research. For a pdf pre-print contact Carl Friedrichs at cfried@vims.edu .)
