Episodes of Ice Rafted Debris and Their Effects on Primary Productivity in the Labrador Sea for the Past 31,000 Years

1994 ◽  
Vol 58A (2) ◽  
pp. 641-642
Author(s):  
A. N. N. Muzuka
Keyword(s):  
Primary Productivity ◽  
Labrador Sea ◽  
The Past

scholarly journals Multicentennial record of Labrador Sea primary productivity and sea-ice variability archived in coralline algal barium

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
P. Chan ◽  
J. Halfar ◽  
W. Adey ◽  
S. Hetzinger ◽  
T. Zack ◽  
...  
Keyword(s):  
Sea Ice ◽  
Primary Productivity ◽  
Labrador Sea

2000 years of marine primary productivity in the Eastern Tropical North Pacific

2020 ◽  
Author(s):  
Christina Treinen-Crespo ◽  
Jose Carriquiry ◽  
Julio Villaescusa ◽  
Elisabet Repiso-Terrones
Keyword(s):  
High Resolution ◽  
Climate Variability ◽  
Primary Productivity ◽  
North Pacific ◽  
Biogenic Silica ◽  
Change Scenario ◽  
The Past ◽  
Past 2000 Years ◽  
Increasing Trend ◽  
Marine Primary Productivity

<p>Changes in marine primary productivity (MPP) over the 21st century are expected to occur under the prevailing climate change scenario. For better understanding of past climate variability, we reconstructed MPP at high resolution (~1-2 years) for the past 2000 years analyzing biogenic silica and total organic carbon (TOC %) on a sediment core collected from Soledad Basin (25°N, 112°W), Baja  California, Mexico. Located in the Eastern Tropical North Pacific, this suboxic basin is ideal for palaeoceanographic reconstructions due to its high sedimentation rate (2 mm/year), which allow us to reconstruct past changes in the ocean and climate at high resolution. Our results show an increasing trend in the variability of MPP for the past 2000 years: biogenic silica content does not show a well-defined trend, but rather it is dominated by strong multidecadal and prominent centennial-scale cycles while TOC (%) shows a slight increasing trend towards the present, starting at least 2000 years ago. Spectral analysis confirms the presence of multidecadal to centennial cycles. These results will be discussed in the context of the Anthropocene and natural climate variability.</p>

Assessment on 2000-2010 Ecosystem Function Changes of Yiwulvshan National Nature Scenic Area

2014 ◽  
Vol 1051 ◽  
pp. 489-494
Author(s):  
Xiao Chen Wang ◽  
Jing Hai Zhu ◽  
Yuan Man Hu ◽  
Wei Ling Liu
Keyword(s):  
Remote Sensing ◽  
Ecosystem Function ◽  
Primary Productivity ◽  
Water Conservation ◽  
Net Primary Productivity ◽  
Remote Sensing Data ◽  
Vegetation Coverage ◽  
The Past ◽  
Remote Sensing Technology ◽  
Sensing Technology

Based on the remote-sensing data and ground data, this study is conducted on the ecosystem function of Yiwulvshan National Nature Scenic Area (hereinafter as “Yiwulvshan Scenic Area”) from 2000 to 2010 with the GIS (geographic information system) and RS (remote sensing) technology, so as to provide reference for better environmental protection of the scenic area. It is shown from the results that there is no obvious change of land use in Yiwulvshan Scenic Area; while the capacity for soil and water conservation is slightly improved mainly due to increase of vegetation coverage; the vegetation net primary productivity declines somewhat about 5.27% in past 10 years; and biodiversity is slightly increased. As a whole, the ecosystem function of Yiwulvshan Scenic Area basically kept stable in the past 10 years, which indicated that the existing regulations can effectively protect the ecological function of the Scenic Area.

scholarly journals The change of primary productivity of Lake Bosten in Xinjiang over the past 100 a

2012 ◽  
Vol 24 (3) ◽  
pp. 466-473 ◽  
Author(s):  
ZHENG Boying ◽  
◽  
ZHANG Enlou ◽  
GAO Guang
Keyword(s):  
Primary Productivity ◽  
The Past

Using reconstructed Irminger Water changes within the past three decades to connect the West Greenland shelf to the production of Labrador Sea Water

2021 ◽  
Author(s):  
Kevin Niklas Wiegand ◽  
Dagmar Kieke ◽  
Paul G. Myers
Keyword(s):  
Time Series ◽  
Sea Water ◽  
Meridional Overturning Circulation ◽  
The Arctic ◽  
Labrador Sea ◽  
The West ◽  
West Greenland ◽  
The Past ◽  
Local Water ◽  
Labrador Sea Water

<p>In this study we analyze the exchange processes between the West Greenland shelf and the Labrador Sea. This region is affected by warm and saline waters originating from the subtropical North Atlantic, as well as cold and fresh waters from the Arctic and the Greenland Ice Sheet. Heat and freshwater both impact the local formation of Labrador Sea Water (LSW) that itself is a major contributor to the Atlantic Meridional Overturning Circulation.</p><p>We use the ARMOR3D large-scale hydrographic data set from the Copernicus Marine Environmental Monitoring Service (CMEMS) and validate it with ship-based measurements in the period between 1993 to 2018. By extracting cross-shelf sections from ARMOR3D for various locations around Greenland, we reconstruct time series of local water masses like the Irminger Water (IW) for the past three decades. Previous studies from the West Greenland shelf have shown that IW properties are locally anti-correlated to changes in LSW. We analyze the interannual and decadal variability of these IW time series and compare them towards hydrographic changes observed in the interior Labrador Sea.</p><p>Since ARMOR3D allows us to investigate interannual and decadal changes along cross-shelf sections, the goal of this study is to unravel the complex connection between changes in the shelf regions around Greenland and the interior Labrador Sea, especially the local water mass production.</p>

scholarly journals Negative extreme events in gross primary productivity and their drivers in China during the past three decades

2019 ◽  
Vol 275 ◽  
pp. 47-58 ◽  
Author(s):  
Weizhe Chen ◽  
Dan Zhu ◽  
Chunju Huang ◽  
Philippe Ciais ◽  
Yitong Yao ◽  
...  
Keyword(s):  
Extreme Events ◽  
Primary Productivity ◽  
Gross Primary Productivity ◽  
The Past

scholarly journals Yellowstone Lake: An Evaluation of Patterns in Productivity

1985 ◽  
Vol 9 ◽  
pp. 156-158
Author(s):  
W. Romme ◽  
D. Knight
Keyword(s):  
Primary Productivity ◽  
Trophic Status ◽  
Nutrient Status ◽  
Lake Productivity ◽  
Yellowstone Lake ◽  
The Past ◽  
Large Fires ◽  
Existing Data

This study was initiated in 1982 to critically evaluate the evidence (Varley 1974, Shero and Parker 1977) that primary productivity in Yellowstone Lake has decreased during the last 1500 years with an accelerated decline in the last century. Our specific objectives were the following: 1. Assemble, summarize, and evaluate existing data and observations related to the past and present trophic status of Yellowstone Lake; 2. Identify all possible explanations for the observed pattern in lake productivity, both long-term (last 1500 years) and recent (last 100 years), and summarize and evaluate existing evidence to support or refute each proposed explanation; and 3. Collect new data to test one attractive hypothesis that has been mentioned frequently but never examined closely, namely that changes in the nutrient status and productivity of the lake are related, at least in part, to the effects of large fires in the watershed (Varley 1974, Romme and Knight 1982).

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