Statistical Analysis of Nutrient Loads from the Mississippi-Atchafalaya River Basin (MARB) to the Gulf of Mexico

被引：5

作者：

Okwan, Phyllis ^{[1
]}

Zhen, Yi ^{[2
]}

Feng, Huan ^{[3
]}

Yoo, Shinjae ^{[4
]}

Kambhampati, Murty S. ^{[2
]}

Walker, Abreione ^{[2
]}

Boykin, Shayne ^{[2
]}

Omojola, Joe ^{[2
]}

Blackburn, Noel ^{[5
]}

机构：

[1] Southern Univ & A&M Coll, Dept Math & Phys, Baton Rouge, LA 70813 USA

[2] Southern Univ New Orleans, Dept Nat Sci, New Orleans, LA 70126 USA

[3] Montclair State Univ, Dept Earth & Environm Studies, Montclair, NJ 07043 USA

[4] Brookhaven Natl Lab, Computat Sci Initiat, Upton, NY 11973 USA

[5] Brookhaven Natl Lab, Off Educ Programs, Upton, NY 11973 USA

来源：

ENVIRONMENTS | 2020年 / 7卷 / 01期

关键词：

Gulf of Mexico; nutrient loads; seasonal variations; water quality; NITROGEN; PHOSPHORUS; SPECIATION; TRANSPORT; POLLUTION; DELIVERY; HYPOXIA; IMPACT; FLUXES; YIELDS;

D O I：

10.3390/environments7010008

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study investigated the annual and seasonal variations in nutrient loads (NO2- + NO3- and orthophosphate) delivered to the Gulf of Mexico from the Mississippi-Atchafalaya River Basin (MARB) and examined the water quality variations. The results indicate that (1) annually, the mean NO2- + NO3- and orthophosphate loads showed a steady increase during 1996-1999, a persistent level during 2000-2007, and a moderate increase during 2008-2016; (2) seasonally, NO2- + NO3- and orthophosphate in MARB in spring and summer were higher than those in autumn and winter. Analysis of variance (ANOVA) identified highly significant differences among seasonal loads; and (3) the median value of NO2- + NO3- in normal weather conditions were higher than that during and right after the hurricanes, while the median value of orthophosphate loads in normal weather conditions was higher than that during the hurricanes, but higher than that right after hurricanes. The two-sample t-test indicates a significant difference (p < 0.046) in orthophosphate loads before and after Hurricane Katrina. Moreover, it is found that there is a significant (p < 0.01) increase in nutrient loads during normal weather conditions. The results indicate that hurricane seasons can significantly influence the nutrient loads from the MARB to the Gulf of Mexico.

引用

页数：13

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