气候变化领域集成服务门户(CCPortal): Cryogenic gypsum collected during PS106-1/2 in 2017

CCPortal

DOI	https://doi.pangaea.de/10.1594/PANGAEA.916035
	Cryogenic gypsum collected during PS106-1/2 in 2017
	Wollenburg; Jutta E; Iversen; Morten Hvitfeldt
发布日期	2020-05-08
数据集类型	dataset
英文关键词	cryogenic gypsum ; morphology ; settling velocity
英文简介	To date observations on a single location indicate that cryogenic gypsum (Ca[SO4]·2H2O) may constitute an efficient but hitherto overlooked ballasting mineral enhancing the efficiency of the biological carbon pump in the Arctic Ocean. In June-July 2017 we sampled cryogenic gypsum under pack-ice in the Nansen Basin north of Svalbard using a plankton net mounted on a Remotely Operated Vehicle (ROVnet). Cryogenic gypsum crystals were present at all sampled stations, which suggested a persisting cryogenic gypsum release from melting sea ice throughout the investigated area. This was supported by a sea-ice backtracking model indicating that gypsum release was not related to a specific region of sea ice formation. The observed cryogenic gypsum crystals exhibited a large variability in morphology and size, with the largest crystals exceeding a length of 1 cm. Preservation, temperature and pressure laboratory studies revealed that gypsum dissolution rates accelerated with increasing temperature and pressure, ranging from 6% d-1 by mass in Polar Surface Water (-0.5 °C) to 81% d-1 by mass in Atlantic Water (2.5 °C at 65 bar). When testing the preservation of gypsum in Formaldehyde-fixed samples we observed immediate dissolution. Dissolution at warmer temperatures and through inappropriate preservation media may thus explain why cryogenic gypsum was not observed in scientific samples previously. Direct measurements of gypsum crystal sinking velocities ranged between 200 and 7000 m d-1, suggesting that gypsum-loaded marine aggregates could rapidly sink from the surface to abyssal depths, supporting the hypothesised potential of gypsum as a ballasting mineral in the Arctic Ocean.
空间范围	Median Latitude: 80.467935 * Median Longitude: 25.041092 * South-bound Latitude: 78.102370 * West-bound Longitude: 10.690680 * North-bound Latitude: 81.731000 * East-bound Longitude: 32.455800
时间范围	2017-06-15T06:41:00 - 2017-07-12T15:16:00
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/235729
推荐引用方式 GB/T 7714	Wollenburg,Jutta E,Iversen,et al. Cryogenic gypsum collected during PS106-1/2 in 2017.2020-05-08.https://doi.pangaea.de/10.1594/PANGAEA.916035.