Table 1.
Summary of Survey Cruises
| Year | Datea | Ship | Survey Regionb | Coverage Area | River Dischargec | NO3+NO2 Fluxc | Air CO2 |
|---|---|---|---|---|---|---|---|
| 103km2 | 103m3 s−1 | 109 g N month−1 | μatm | ||||
| 2004 | 9 Aug to 12 Aug | Pelican | LAB | 9.2 | 12.9 | 42.5 | 380 |
| 2005 | 4 Oct to 7 Octd | Pelican | LAB | 4.4 | 7.9 | 19.9 | 387.6 |
| 2006 | 27 Apr to 1 May | Pelican | LAB | 7.2 | 17.3 | 96.0 | 375 |
| 2006 | 6 Jun to 11 Jun | Bold | nGOM | 34.1 | 12.2 | 60.2 | 386 |
| 2006 | 6 Sep to 11 Sep | Bold | nGOM | 34.7 | 7.5 | 19.7 | 369.5 |
| 2007 | 2 May to 7 May | Bold | nGOM | 39.1 | 25.4 | 148 | 379 |
| 2007 | 18 Aug to 24 Aug | Bold | nGOM | 41.4 | 12.1 | 31.2 | 384 |
| 2008 | 17 Jul to 20 Jul | Pelican | in‐LAs | 14.9 | 28.4 | 138.0 | 385 |
| 2009 | 9 Jan to 20 Jan | Cape Hatteras | nGOM | 41.4 | 23.9 | 92.6 | 371.7 |
| 2009 | 20 Apr to 1 May | Cape Hatteras | nGOM | 41.4 | 30.9 | 151.0 | 386 |
| 2009 | 19 Jul to 29 Juld | Cape Hatteras | nGOM | 41.4 | 18.9 | 73.5 | 387.3 |
| 2009 | 28 Oct to 7 Nov | Hugh R. Sharp | nGOM | 41.4 | 25.6 | 52.4 | 371.8 |
| 2010 | 9 Mar to 21 Mard | Cape Hatteras | nGOM | 40.9 | 27.8 | 121.0 | 379 |
a
Spring was from March to May, summer was from June to August, fall was from September to November, and winter was from December to February in this study.
b
LAB: the Louisiana Bight and its adjacent area; nGOM: the northern Gulf of Mexico; in‐LAs: the inner Louisiana shelf.
c
River discharge and monthly NO3+NO2 flux data were in Mississippi and Atchafalaya Rivers. Data from the U.S. Geological Survey (USGS) “Hypoxia in the Gulf of Mexico studies.”
d
Cruise affected by weather events.