Impacts of anthropogenic inputs on the hypoxia and oxygen dynamics in the Pearl River Estuary

Wang, Bin; Hu, Jiatang; Li, Shiyu; Yu, Liuqian; Jia, Hongyan

doi:10.5194/bg-2018-134

Cited by 1 publication

(1 citation statement)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 1‐mg/L adjustment scheme has also been adopted by other modeling studies in the Gulf of Mexico, for example, Scavia et al's () and Liu et al's () differential equation‐based two‐element models. It was also chosen in hypoxia studies of other estuaries using complex coupled physical biogeochemical models, for example, Zhou et al's () study in the Changjiang Estuary and Wang et al's () study in the Pearl River Estuary.…”

Section: Discussionmentioning

confidence: 99%

Seasonal and Interannual Variability of Areal Extent of the Gulf of Mexico Hypoxia from a Coupled Physical‐Biogeochemical Model: A New Implication for Management Practice

et al. 2019

View full text Add to dashboard Cite

The extent of hypoxia on the Louisiana shelf has been measured during July since 1985. The measured area was assumed to represent the seasonal maximum each year and was related to the Mississippi‐Atchafalaya riverine May NO2+3 loading and May–June total nitrogen loading, for planning management strategies. In this study, we analyze 25 years of simulations from a coupled physical‐biogeochemical model. An empirical orthogonal function analysis of the hypoxia frequency reveals that the dominant pattern is east‐west, with the seasonal maximum occurring in June, July, or August. This indicates that the July hypoxic area may or may not always be the largest of the year. A simple linear regression model was constructed to examine the explained variance of hypoxia attributable to nutrients. Results reveal that the May NO2+3 (May–June total nitrogen) loading can explain 35% ± 7% (54% ± 7%) of the maximum cumulative hypoxic area in contrast to 22% ± 9% (48% ± 12%) of the July cumulative hypoxic area. Our results suggest that the current nitrogen loading reduction suggested by the Hypoxia Task Force 2013 is not sufficient to reduce the 5‐year moving average Gulf's hypoxic zone to less than 5,000 km2. A reduction of at least 66% (48%) of May NO2+3 (May–June total N) loading is needed when using July hypoxic area as the criterion, while a reduction of 77% (60%) of May NO2+3 (May–June total N) loading is needed when using maximum hypoxic area.

show abstract

Section: Discussionmentioning

confidence: 99%