scholarly journals Enhanced deepwater circulation and shift of sedimentary organic matter oxidation pathway in the Okinawa Trough since the Holocene

2005 ◽  
Vol 32 (15) ◽  
Author(s):  
S. J. Kao
Keyword(s):  
Organic Matter ◽  
Okinawa Trough ◽  
Sedimentary Organic Matter ◽  
The Holocene ◽  
Oxidation Pathway ◽  
The Okinawa Trough ◽  
Organic Matter Oxidation

Lake Wabamun, Alta.: a paleoenvironmental study

1984 ◽  
Vol 62 (7) ◽  
pp. 1438-1465 ◽  
Author(s):  
M. Hickman ◽  
C. E. Schweger ◽  
T. Habgood
Keyword(s):  
Organic Matter ◽  
Catchment Area ◽  
Benthic Algae ◽  
Climatic Changes ◽  
Water Levels ◽  
Sedimentary Organic Matter ◽  
Tephra Layer ◽  
The Holocene ◽  
Fossil Pigments ◽  
The Core

Results from paleoenvironmental investigations of Lake Wabamun, Alta. (longitudes 114°26′ and 114°44′ W; latitudes 50°30′ and 53°35′ N), show that the sedimentary record spans the Holocene period in the case of the core taken from the deepest portion of the lake (the Seba core), while the record from the shallow Moonlight Bay spans a somewhat shorter interval. Basically, the lake has changed little during the last 4000 years except for increases in submersed hydrophytes in Moonlight Bay and undoubtedly other shallow regions of the lake. Production, too, has changed little during this interval except in Moonlight Bay, where hydrophytes and benthic algae contributed more to the sedimentary organic matter and fossil pigments. The deposition of the Mt. Mazama tephra in the catchment area and lake at 6600 years BP may have had a profound effect upon the lake. Increased turbidity occurred. This together with climatic changes including increased precipitation and catchment-area instability caused rapid infilling of the lake and low production. Moreover, prior to deposition of the tephra layer, water levels were lower and the water was more saline with Ruppia present, a feature found in other lakes in Alberta during the Hypsithermal period. Finally, prior to this period the lake was similar to its present day condition except during its very beginning when more turbid conditions prevailed.

A biomarker record of temperature and phytoplankton community structure in the Okinawa Trough since the last glacial maximum

2017 ◽  
Vol 88 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Jiaping Ruan ◽  
Yunping Xu ◽  
Su Ding ◽  
Yinghui Wang ◽  
Xinyu Zhang
Keyword(s):  
Phytoplankton Community ◽  
Okinawa Trough ◽  
Kuroshio Current ◽  
Community Change ◽  
Community Structures ◽  
Ocean Drilling Program ◽  
The Holocene ◽  
The Okinawa Trough ◽  
The Kuroshio ◽  
The Last Glacial

AbstractA variety of biomarkers were examined from Ocean Drilling Program Core 1202B to reconstruct temperature and phytoplankton community structures in the southern Okinawa Trough since 20 ka. Two molecular temperature proxies ( $${\rm U}_{{37}}^{{{\rm K}\prime}} $$ and TEX86) show 5°C to ~6°C warming during the glacial-interglacial transition. Prior to the Holocene, the $${\rm U}_{{37}}^{{{\rm K}\prime}} $$ -derived temperature was generally 1°C to 4°C higher than TEX86-derived temperature. This difference, however, was reduced to <1°C in the Holocene. Correspondingly, the phytoplankton biomarkers (e.g., C37:2 alkenone, brassicasterol, C30 1,15 diol, and dinosterol) indicate a shift of planktonic community structures, with coccolithophorids becoming more abundant in the Holocene at the expense of diatoms/dinoflagellates. This shift is related to the variability of nutrients, temperature, and salinity in the Okinawa Trough, likely controlled by the sea level and the intensity of the Kuroshio Current. The phytoplankton community change may have had profound implications for atmospheric CO2 fluctuations during glacial-interglacial cycles since diatoms and dinoflagellates have a higher efficiency of the biological pump than coccolithophorids.

scholarly journals The Holocene Pulleniatina Minimum Event revisited: Geochemical and faunal evidence from the Okinawa Trough and upper reaches of the Kuroshio current

2006 ◽  
Vol 59 (3-4) ◽  
pp. 153-170 ◽  
Author(s):  
Yu-Shih Lin ◽  
Kuo-Yen Wei ◽  
In-Tian Lin ◽  
Pai-Sen Yu ◽  
Hong-Wei Chiang ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Kuroshio Current ◽  
The Holocene ◽  
The Okinawa Trough ◽  
The Kuroshio

Characteristics of hydrocarbons in hydrothermal products of the Clam hydrothermal field from the Okinawa trough

2021 ◽  
Vol 167 ◽  
pp. 112277
Author(s):  
Xin Huang ◽  
Chao Huang ◽  
Yali Qi ◽  
Xiaoyuan Wang ◽  
Hansheng Cao
Keyword(s):  
Okinawa Trough ◽  
Hydrothermal Field ◽  
The Okinawa Trough

Amino acids and amino sugars as indicators of the source and degradation state of sedimentary organic matter

2021 ◽  
Vol 230 ◽  
pp. 103931
Author(s):  
Jin-E Wei ◽  
Yan Chen ◽  
Jian Wang ◽  
Shi-Bo Yan ◽  
Hong-Hai Zhang ◽  
...  
Keyword(s):  
Amino Acids ◽  
Organic Matter ◽  
Sedimentary Organic Matter ◽  
Amino Sugars ◽  
Degradation State
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