thumbnail

A scenario and forecast model for Gulf of Mexico hypoxic area and volume

Environmental Science and Technology

By:
, , and
DOI: 10.1021/es4025035

Links

Abstract

For almost three decades, the relative size of the hypoxic region on the Louisiana-Texas continental shelf has drawn scientific and policy attention. During that time, both simple and complex models have been used to explore hypoxia dynamics and to provide management guidance relating the size of the hypoxic zone to key drivers. Throughout much of that development, analyses had to accommodate an apparent change in hypoxic sensitivity to loads and often cull observations due to anomalous meteorological conditions. Here, we describe an adaptation of our earlier, simple biophysical model, calibrated to revised hypoxic area estimates and new hypoxic volume estimates through Bayesian estimation. This application eliminates the need to cull observations and provides revised hypoxic extent estimates with uncertainties, corresponding to different nutrient loading reduction scenarios. We compare guidance from this model application, suggesting an approximately 62% nutrient loading reduction is required to reduce Gulf hypoxia to the Action Plan goal of 5,000 km2, to that of previous applications. In addition, we describe for the first time, the corresponding response of hypoxic volume. We also analyze model results to test for increasing system sensitivity to hypoxia formation, but find no strong evidence of such change.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
A scenario and forecast model for Gulf of Mexico hypoxic area and volume
Series title:
Environmental Science and Technology
DOI:
10.1021/es4025035
Volume
47
Issue:
18
Year Published:
2013
Language:
English
Publisher:
ACS Publications
Contributing office(s):
Great Lakes Science Center
Description:
6 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Environmental Science and Technology