scholarly journals Seasonality of decadal-scale trophic declines and nutrient regime shifts in the Laysan albatross and Newell’s shearwater

2020 ◽  
Author(s):  
KE Morra ◽  
Y Chikaraishi ◽  
HF James ◽  
S Rossman ◽  
AE Wiley ◽  
...  
Keyword(s):  
Regime Shifts ◽  
Nutrient Regime ◽  
Decadal Scale ◽  
Laysan Albatross

scholarly journals Tropical–North Pacific Climate Linkages over the Past Four Centuries*

2005 ◽  
Vol 18 (24) ◽  
pp. 5253-5265 ◽  
Author(s):  
Rosanne D’Arrigo ◽  
Rob Wilson ◽  
Clara Deser ◽  
Gregory Wiles ◽  
Edward Cook ◽  
...  
Keyword(s):  
Twentieth Century ◽  
Tree Ring ◽  
North Pacific ◽  
Climatic Variability ◽  
Regime Shifts ◽  
Climate Index ◽  
Climate Indices ◽  
Supporting Evidence ◽  
The Past ◽  
Decadal Scale

Abstract Analyses of instrumental data demonstrate robust linkages between decadal-scale North Pacific and tropical Indo-Pacific climatic variability. These linkages encompass common regime shifts, including the noteworthy 1976 transition in Pacific climate. However, information on Pacific decadal variability and the tropical high-latitude climate connection is limited prior to the twentieth century. Herein tree-ring analysis is employed to extend the understanding of North Pacific climatic variability and related tropical linkages over the past four centuries. To this end, a tree-ring reconstruction of the December–May North Pacific index (NPI)—an index of the atmospheric circulation related to the Aleutian low pressure cell—is presented (1600–1983). The NPI reconstruction shows evidence for the three regime shifts seen in the instrumental NPI data, and for seven events in prior centuries. It correlates significantly with both instrumental tropical climate indices and a coral-based reconstruction of an optimal tropical Indo-Pacific climate index, supporting evidence for a tropical–North Pacific link extending as far west as the western Indian Ocean. The coral-based reconstruction (1781–1993) shows the twentieth-century regime shifts evident in the instrumental NPI and instrumental tropical Indo-Pacific climate index, and three previous shifts. Changes in the strength of correlation between the reconstructions over time, and the different identified shifts in both series prior to the twentieth century, suggest a varying tropical influence on North Pacific climate, with greater influence in the twentieth century. One likely mechanism is the low-frequency variability of the El Niño–Southern Oscillation (ENSO) and its varying impact on Indo-Pacific climate.

Recruitment and survival of Northeast Pacific Ocean fish stocks: temporal trends, covariation, and regime shifts

2007 ◽  
Vol 64 (6) ◽  
pp. 911-927 ◽  
Author(s):  
Franz J Mueter ◽  
Jennifer L Boldt ◽  
Bernard A Megrey ◽  
Randall M Peterman
Keyword(s):  
Bering Sea ◽  
Regime Shift ◽  
Temporal Trends ◽  
Gulf Of Alaska ◽  
Regime Shifts ◽  
Environmental Forcing ◽  
Fish Stocks ◽  
Large Marine Ecosystems ◽  
Decadal Scale ◽  
Climatic Regime

Two measures of productivity for fish stocks (recruitment and stock–recruit residuals) within two large marine ecosystems (Gulf of Alaska and eastern Bering Sea – Aleutian Islands) showed significant positive covariation within several groups of species and significant negative covariation between certain others. For example, stock–recruit residuals of gadids (Gadidae) in the Bering Sea were inversely related to those of shelf flatfishes (Pleuronectidae), suggesting that environmental forcing affects these groups in opposite ways. Salmon (Oncorhynchus spp.), Pacific herring (Clupea pallasii), and groundfish stocks each showed strong patterns of covariation within these taxonomic groups and within ecosystems, and both salmon and groundfish stocks showed positive covariation between the two ecosystems. However, we found little evidence of covariation between salmon and herring stocks or between these stocks and demersal stocks. Recruitment and stock–recruit residuals in individual stocks did not show a consistent response to known climatic regime shifts. However, combined indices of productivity across stocks showed decadal-scale variability (regime-like patterns), suggesting that both pelagic productivity (mostly salmon) and demersal productivity increased in response to the well-documented 1976–1977 climatic regime shift, whereas the 1988–1989 regime shift produced inconsistent or short-lived responses.

scholarly journals Remote climate forcing of decadal-scale regime shifts in Northwest Atlantic shelf ecosystems

2013 ◽  
Vol 58 (3) ◽  
pp. 803-816 ◽  
Author(s):  
Charles H. Greene ◽  
Erin Meyer-Gutbrod ◽  
Bruce C. Monger ◽  
Louise P. McGarry ◽  
Andrew J. Pershing ◽  
...  
Keyword(s):  
Regime Shifts ◽  
Climate Forcing ◽  
Northwest Atlantic ◽  
Decadal Scale

Reconstruction of maximum temperature on Zhegu Mountain, western Sichuan Plateau (China)

2020 ◽  
Vol 81 ◽  
pp. 1-14
Author(s):  
M Keyimu ◽  
Z Li ◽  
Y Zhao ◽  
Y Dong ◽  
B Fu ◽  
...  
Keyword(s):  
Tree Growth ◽  
Ring Width ◽  
Volcanic Eruptions ◽  
Southwestern China ◽  
Maximum Temperature ◽  
Driving Mechanism ◽  
Western Sichuan ◽  
Relationship Analysis ◽  
Decadal Scale ◽  
Thermal Variability

Historical temperature reconstructions at high altitudes are still insufficient in southwestern China, which is considered one of the most sensitive areas to climate change in the world. Here we developed a tree ring-width chronology of Faxon fir Abies fargesii var. faxoniana at the upper timber line on Zhegu Mountain, Miyaluo Scenic Area, western Sichuan, China. The climate-tree growth relationship analysis indicated temperature as the dominant regulator on radial tree growth in this region. The reconstruction of aggregated maximum temperature (TMX) of autumn and winter for the period 1856-2016 was achieved with a linear regression model that accounted for 43.6% of the actual variability in the common time series (1954-2016). The reconstruction identified 4 warm periods and 3 cold periods. Similarities of warm and cold periods with previously published reconstructions from nearby sites indicated the reliability of our reconstruction. The significant positive correlation between TMX reconstruction and the Asian-Pacific Oscillation index and the Atlantic Multi-decadal Oscillation index suggested a linkage between large-scale climate circulations and the thermal variability at a multi-decadal scale on the western Sichuan Plateau. We also found that solar activity exerted a strong influence on decadal temperature variability in this region. The cold periods were matched well with historical large volcanic eruptions. Our results strengthen the historical climatic information in southwestern China and contribute to further understanding the regional thermal variability as well as its driving mechanism.

First record of Laysan Albatross (Phoebastria immutabilis) in Korea

2018 ◽  
Vol 25 (1) ◽  
pp. 19-22
Author(s):  
Jin-Won Yang ◽  
Seung-Gu Kang ◽  
Won-Ho Lee ◽  
Meong-Kyu Jeong
Keyword(s):  
First Record ◽  
Phoebastria Immutabilis ◽  
Laysan Albatross
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