Arévalo-Martínez, Damian L; Bange, Hermann Werner (2019): High Resolution Underway Nitrous Oxide Measurements (water) during METEOR cruise M99 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.902507, In supplement to: Arévalo-Martínez, Damian L; Steinhoff, T; Brandt, Peter; Körtzinger, Arne; Lamont, Tarron; Rehder, Gregor; Bange, Hermann Werner (2019): N2O Emissions From the Northern Benguela Upwelling System. Geophysical Research Letters, 46(6), 3317-3326, https://doi.org/10.1029/2018GL081648
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Abstract:
The Benguela Upwelling System (BUS) is the most productive of all eastern boundary upwelling ecosystems and it hosts a well-developed oxygen minimum zone. As such, the BUS is a potential hotspot for production of N2O, a potent greenhouse gas derived from microbially driven decay of sinking organic matter. Yet, the extent at which near-surface waters emit N2O to the atmosphere in the BUS is highly uncertain. Here we present the first high-resolution surface measurements of N2O across the northern part of the BUS (nBUS).We found strong gradients with a threefold increase in N2O concentrations near the coast as compared with open ocean waters. Our observations show enhanced sea-to-air fluxes of N2O (up to 1.67 nmol m−2 s−1) in association with local upwelling cells. Based on our data we suggest that the nBUS can account for 13% of the total coastal upwelling source of N2O to the atmosphere
Project(s):
Coverage:
Median Latitude: -25.163751 * Median Longitude: 12.330205 * South-bound Latitude: -28.239200 * West-bound Longitude: 10.840200 * North-bound Latitude: -22.330100 * East-bound Longitude: 14.936800
Date/Time Start: 2013-08-01T13:50:15 * Date/Time End: 2013-08-22T22:42:11
Minimum DEPTH, water: 6 m * Maximum DEPTH, water: 6 m
Event(s):
M99-track * Latitude Start: -22.941000 * Longitude Start: 14.503000 * Latitude End: -22.941000 * Longitude End: 14.503000 * Date/Time Start: 2013-07-31T00:00:00 * Date/Time End: 2013-08-23T00:00:00 * Location: Southeast Atlantic * Campaign: M99 * Basis: Meteor (1986) * Method/Device: Underway cruise track measurements (CT) * Comment: Walvis Bay - Walvis Bay
Comment:
Gas molar fraction of N2O (1-min means) was calibrated according to the procedure from Arevalo-MartÌnez et. al (2013)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Arévalo-Martínez, Damian L | Geocode | ||
| 2 | LATITUDE | Latitude | Arévalo-Martínez, Damian L | Geocode | ||
| 3 | DEPTH, water | Depth water | m | Arévalo-Martínez, Damian L | Geocode | |
| 4 | LONGITUDE | Longitude | Arévalo-Martínez, Damian L | Geocode | ||
| 5 | Sea surface temperature | SST | °C | Arévalo-Martínez, Damian L | ||
| 6 | Sea surface salinity | SSS | Arévalo-Martínez, Damian L | |||
| 7 | Temperature at equilibration | Tequ | °C | Arévalo-Martínez, Damian L | ||
| 8 | Nitrous oxide, dry-air mole fraction | N2O | nmol/mol | Arévalo-Martínez, Damian L | ||
| 9 | Nitrous oxide, dissolved | N2O | nmol/l | Arévalo-Martínez, Damian L | Gas chromatography (unfiltered) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
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