کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8868381 1622099 2018 33 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatial and temporal distribution of C37 alkenones in suspended materials in the northern East China Sea
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Spatial and temporal distribution of C37 alkenones in suspended materials in the northern East China Sea
چکیده انگلیسی
The temporal and spatial distributions of long-chain (C37) alkenones in suspended materials in the northern East China Sea (ECS) were investigated to examine the applicability of alkenone unsaturation index as a proxy for sea surface temperature (SST) and that of total C37 alkenone concentration as a proxy for marine primary productivity. Surface and subsurface seawater samples were collected at three-month intervals (February, May, August, and November) during 2007-2010. The results showed that alkenones were synthesized throughout the year, with peaks in May. Alkenone temperatures corresponded to in situ temperatures. The vertical distribution of alkenone concentration indicated that alkenone production depth is the surface mixed layer (0-20 m). These results indicate that alkenone temperatures from marine sediments on the continental shelf most likely reflect the annual average SST. No clear inferences could be made on the influence of nutrients and salinity on the alkenone temperature in this area. Seasonal changes in alkenone concentration were compared with those in chlorophyll-a concentration to investigate the suitability of using total C37 alkenone concentration as a proxy for productivity. Where the chlorophyll-a concentration was high, the alkenone concentration was low, and vice versa, because the main primary producer was not the coccolithophores. Therefore, it is not appropriate to use alkenone concentration as a primary productivity proxy in the ECS. However, comparisons to coccolithophore abundance show that total C37 alkenone concentration can be used as a haptophyte productivity proxy in this area.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volume 493, 15 March 2018, Pages 102-110
نویسندگان
, , , ,