scholarly journals An Adaptive Method for Nonlinear Sea Level Trend Estimation by Combining EMD and SSA

2021 ◽  
Author(s):  
Taoyong Jin ◽  
Mingyu Xiao ◽  
Weiping Jiang ◽  
CK Shum ◽  
Hao Ding ◽  
...  
Keyword(s):  
Sea Level ◽  
Adaptive Method ◽  
Trend Estimation ◽  
Sea Level Trend

Holocene sea level trend on the west coast of Bohai Bay, China: reanalysis and standardization

2021 ◽  
Vol 40 (7) ◽  
pp. 198-248
Author(s):  
Jianfen Li ◽  
Zhiwen Shang ◽  
Fu Wang ◽  
Yongsheng Chen ◽  
Lizhu Tian ◽  
...  
Keyword(s):  
Sea Level ◽  
West Coast ◽  
Bohai Bay ◽  
The West ◽  
Sea Level Trend ◽  
Holocene Sea Level

scholarly journals Tropical Pacific spatial trend patterns in observed sea level: internal variability and/or anthropogenic signature?

2012 ◽  
Vol 8 (2) ◽  
pp. 787-802 ◽  
Author(s):  
B. Meyssignac ◽  
D. Salas y Melia ◽  
M. Becker ◽  
W. Llovel ◽  
A. Cazenave
Keyword(s):  
Sea Level ◽  
Climate Models ◽  
Internal Variability ◽  
Tropical Pacific ◽  
External Forcing ◽  
Spatial Trend ◽  
Trend Pattern ◽  
Coupled Climate Models ◽  
Sea Level Trend ◽  
The Tropical Pacific

Abstract. In this study we focus on the sea level trend pattern observed by satellite altimetry in the tropical Pacific over the 1993–2009 time span (i.e. 17 yr). Our objective is to investigate whether this 17-yr-long trend pattern was different before the altimetry era, what was its spatio-temporal variability and what have been its main drivers. We try to discriminate the respective roles of the internal variability of the climate system and of external forcing factors, in particular anthropogenic emissions (greenhouse gases and aerosols). On the basis of a 2-D past sea level reconstruction over 1950–2009 (based on a combination of observations and ocean modelling) and multi-century control runs (i.e. with constant, preindustrial external forcing) from eight coupled climate models, we have investigated how the observed 17-yr sea level trend pattern evolved during the last decades and centuries, and try to estimate the characteristic time scales of its variability. For that purpose, we have computed sea level trend patterns over successive 17-yr windows (i.e. the length of the altimetry record), both for the 60-yr long reconstructed sea level and the model runs. We find that the 2-D sea level reconstruction shows spatial trend patterns similar to the one observed during the altimetry era. The pattern appears to have fluctuated with time with a characteristic time scale of the order of 25–30 yr. The same behaviour is found in multi-centennial control runs of the coupled climate models. A similar analysis is performed with 20th century coupled climate model runs with complete external forcing (i.e. solar plus volcanic variability and changes in anthropogenic forcing). Results suggest that in the tropical Pacific, sea level trend fluctuations are dominated by the internal variability of the ocean–atmosphere coupled system. While our analysis cannot rule out any influence of anthropogenic forcing, it concludes that the latter effect in that particular region is stillhardly detectable.

scholarly journals Wind- versus Eddy-Forced Regional Sea Level Trends and Variability in the North Pacific Ocean

2015 ◽  
Vol 28 (4) ◽  
pp. 1561-1577 ◽  
Author(s):  
Bo Qiu ◽  
Shuiming Chen ◽  
Lixin Wu ◽  
Shinichiro Kida
Keyword(s):  
Pacific Ocean ◽  
Sea Level ◽  
Momentum Flux ◽  
North Pacific Ocean ◽  
Kuroshio Extension ◽  
The Past ◽  
The North ◽  
The Pacific ◽  
Regional Sea Level ◽  
Sea Level Trend

Abstract Regional sea level trend and variability in the Pacific Ocean have often been considered to be induced by low-frequency surface wind changes. This study demonstrates that significant sea level trend and variability can also be generated by eddy momentum flux forcing due to time-varying instability of the background oceanic circulation. Compared to the broad gyre-scale wind-forced variability, the eddy-forced sea level changes tend to have subgyre scales and, in the North Pacific Ocean, they are largely confined to the Kuroshio Extension region (30°–40°N, 140°–175°E) and the Subtropical Countercurrent (STCC) region (18°–28°N, 130°–175°E). Using a two-layer primitive equation model driven by the ECMWF wind stress data and the eddy momentum fluxes specified by the AVISO sea surface height anomaly data, the relative importance of the wind- and eddy-forced regional sea level trends in the past two decades is quantified. It is found that the increasing (decreasing) trend south (north) of the Kuroshio Extension is due to strengthening of the regional eddy forcing over the past two decades. On the other hand, the decreasing (increasing) sea level trend south (north) of the STCC is caused by the decadal weakening of the regional eddy momentum flux forcing. These decadal eddy momentum flux changes are caused by the background Kuroshio Extension and STCC changes in connection with the Pacific decadal oscillation (PDO) wind pattern shifting from a positive to a negative phase over the past two decades.

Change of sea level trend in the Mediterranean and Black seas

2005 ◽  
Vol 63 (6) ◽  
pp. 1085-1100 ◽  
Author(s):  
I. Vigo ◽  
D. Garcia ◽  
B. F. Chao
Keyword(s):  
Sea Level ◽  
The Mediterranean ◽  
Sea Level Trend ◽  
Mediterranean And Black Seas

A new insight on the decreasing sea level trend over the Ionian basin in the last decades

2009 ◽  
Vol 68 (3) ◽  
pp. 232-235 ◽  
Author(s):  
Jorge Del Río Vera ◽  
Francisco Criado-Aldeanueva ◽  
Jesús García-Lafuente ◽  
F. Javier Soto-Navarro
Keyword(s):  
Sea Level ◽  
Sea Level Trend
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