气候变化领域集成服务门户(CCPortal): Underway measurements of dissolved gases along POLARSTERN cruise track ANT-XXVII/2

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.848615
	Underway measurements of dissolved gases along POLARSTERN cruise track ANT-XXVII/2
	Bittig; Henry; Körtzinger; Arne
发布日期	2015-08-07
数据集类型	dataset
英文简介	We present measurements of pCO2, O2 concentration, biological oxygen saturation (Delta O2/Ar) and N2 saturation (Delta N2) in Southern Ocean surface waters during austral summer, 2010-2011. Phytoplankton biomass varied strongly across distinct hydrographic zones, with high chlorophyll a (Chla) concentrations in regions of frontal mixing and sea-ice melt. pCO2 and Delta O2 /Ar exhibited large spatial gradients (range 90 to 450 µatm and -10 to 60%, respectively) and co-varied strongly with Chla. However, the ratio of biological O2 accumulation to dissolved inorganic carbon (DIC) drawdown was significantly lower than expected from photosynthetic stoichiometry, reflecting the differential time-scales of O2 and CO2 air-sea equilibration. We measured significant oceanic CO2 uptake, with a mean air-sea flux (~ -20 mmol m-2 d-1) that significantly exceeded regional climatological values. N2 was mostly supersaturated in surface waters (mean Delta N2 of +2.5 %), while physical processes resulted in both supersaturation and undersaturation of mixed layer O2 (mean Delta O2phys = 2.1 %). Box model calculations were able to reproduce much of the spatial variability of Delta N2 and Delta O2phys along the cruise track, demonstrating significant effects of air-sea exchange processes (e.g. atmospheric pressure changes and bubble injection) and mixed layer entrainment on surface gas disequilibria. Net community production (NCP) derived from entrainment-corrected surface Delta O2 /Ar data, ranged from ~ -40 to > 300 mmol O2 m-2 d-1 and showed good coherence with independent NCP estimates based on seasonal mixed layer DIC deficits. Elevated NCP was observed in hydrographic frontal zones and regions of sea-ice melt with shallow mixed layer depths, reflecting the importance of mixing in controlling surface water light and nutrient availability.
空间范围	Median Latitude: -61.712460 * Median Longitude: -32.894457 * South-bound Latitude: -71.124200 * West-bound Longitude: -75.334400 * North-bound Latitude: -33.857600 * East-bound Longitude: 18.438700
时间范围	2010-11-28T08:00:40 - 2011-02-03T07:59:40
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/216984
推荐引用方式 GB/T 7714	Bittig,Henry,Körtzinger,et al. Underway measurements of dissolved gases along POLARSTERN cruise track ANT-XXVII/2.2015-08-07.https://doi.org/10.1594/PANGAEA.848615.