Linkage between multi-model uncertainties and the role of ocean heat content in ocean carbon uptake

2018 ◽  
Vol 68 (10) ◽  
pp. 1311-1319
Author(s):  
Weiwei Fu
Keyword(s):  
Heat Content ◽  
Ocean Heat Content ◽  
Carbon Uptake ◽  
Model Uncertainties ◽  
Ocean Carbon

scholarly journals Influences of Pacific Climate Variability on Decadal Subsurface Ocean Heat Content Variations in the Indian Ocean

2018 ◽  
Vol 31 (10) ◽  
pp. 4157-4174 ◽  
Author(s):  
Xiaolin Jin ◽  
Young-Oh Kwon ◽  
Caroline C. Ummenhofer ◽  
Hyodae Seo ◽  
Franziska U. Schwarzkopf ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Boundary Conditions ◽  
Heat Content ◽  
Western Indian Ocean ◽  
Ocean Heat Content ◽  
Ekman Pumping ◽  
Subsurface Ocean ◽  
The Pacific ◽  
The Indian Ocean

Abstract Decadal variabilities in Indian Ocean subsurface ocean heat content (OHC; 50–300 m) since the 1950s are examined using ocean reanalyses. This study elaborates on how Pacific variability modulates the Indian Ocean on decadal time scales through both oceanic and atmospheric pathways. High correlations between OHC and thermocline depth variations across the entire Indian Ocean Basin suggest that OHC variability is primarily driven by thermocline fluctuations. The spatial pattern of the leading mode of decadal Indian Ocean OHC variability closely matches the regression pattern of OHC on the interdecadal Pacific oscillation (IPO), emphasizing the role of the Pacific Ocean in determining Indian Ocean OHC decadal variability. Further analyses identify different mechanisms by which the Pacific influences the eastern and western Indian Ocean. IPO-related anomalies from the Pacific propagate mainly through oceanic pathways in the Maritime Continent to impact the eastern Indian Ocean. By contrast, in the western Indian Ocean, the IPO induces wind-driven Ekman pumping in the central Indian Ocean via the atmospheric bridge, which in turn modifies conditions in the southwestern Indian Ocean via westward-propagating Rossby waves. To confirm this, a linear Rossby wave model is forced with wind stresses and eastern boundary conditions based on reanalyses. This linear model skillfully reproduces observed sea surface height anomalies and highlights both the oceanic connection in the eastern Indian Ocean and the role of wind-driven Ekman pumping in the west. These findings are also reproduced by OGCM hindcast experiments forced by interannual atmospheric boundary conditions applied only over the Pacific and Indian Oceans, respectively.

scholarly journals A Theory of the Spring Persistence Barrier on ENSO. Part III: The role of Tropical Pacific Ocean Heat Content

2021 ◽  
pp. 1-36
Author(s):  
Yishuai Jin ◽  
Zhengyu Liu ◽  
Michael J. McPhaden
Keyword(s):  
Growth Rate ◽  
Lead Time ◽  
Southern Oscillation ◽  
Heat Content ◽  
Ocean Heat Content ◽  
Upper Ocean Heat Content ◽  
Correlation Relationship ◽  
The Relationship ◽  
Sst Anomalies

AbstractIn this paper, we investigate the relationship between upper ocean heat content (OHC) and El Niño-Southern Oscillation (ENSO) sea surface temperature (SST) anomalies mainly using the neutral recharge oscillator (NRO) model both analytically and numerically. Previous studies showed that spring OHC, which leads SST by 6-12 months, represents a major source of predictability for ENSO. It is suggested that this seasonality is caused by the seasonally varying growth rate in SST anomalies. Moreover, a shortened ENSO period will lead to a reduced SST predictability from OHC, with the most significant decrease occurring in the latter half of the calendar year. The cross-correlation relationship between OHC and ENSO SST anomalies is further identified in damped and self-excited version of the recharge oscillator model. Finally, we suggest that the seasonal growth rate of ENSO anomalies is the cause of the seasonality in the effectiveness of OHC as a predictor in ENSO forecasting. We also explain the shorter lead time between spring OHC and ENSO SST anomalies after the turn of the 21st century in terms of the apparent higher frequency of the ENSO period.

scholarly journals A theory of Spring Persistence Barrier on ENSO. Part II: Persistence Barriers in SST and ocean heat content

2021 ◽  
pp. 1-30
Author(s):  
Yishuai Jin ◽  
Zhengyu Liu
Keyword(s):  
Growth Rate ◽  
Numerical Solutions ◽  
Southern Oscillation ◽  
Heat Content ◽  
Ocean Heat Content ◽  
Seasonal Growth ◽  
Approximate Analytical Solutions ◽  
Potential Factors ◽  
The Relationship

AbstractIn this paper, we investigate the potential factors that control the relationship between the El Niño-Southern Oscillation (ENSO) persistence barriers (PB) in sea surface temperature (SST) and ocean heat content (OHC) and apply it to explain observational ENSO PBs. With the addition of seasonal growth rate in SST in the neutral recharge oscillator (NRO) model, approximate analytical solutions of autocorrelation functions for SST and OHC suggest strictly that the timing of PB for OHC leads that of SST by half a year and the strength of the two PBs are the same. The numerical solutions of the NRO model also show a similar relationship. The role of ENSO growth rate to PBs in SST and OHC is then identified in the damped and unstable ENSO regime. Therefore, it is suggested that for the observational ENSO, the seasonally varying ENSO growth rate in SST controls PBs in SST and OHC simultaneously.

Role of ocean heat content in boosting post-monsoon tropical storms over Bay of Bengal during La-Niña events

2016 ◽  
Vol 52 (12) ◽  
pp. 7225-7234
Author(s):  
Suchandra Aich Bhowmick ◽  
N. Agarwal ◽  
M. M. Ali ◽  
C. M. Kishtawal ◽  
Rashmi Sharma
Keyword(s):  
Bay Of Bengal ◽  
Heat Content ◽  
La Niña ◽  
Ocean Heat Content ◽  
Tropical Storms ◽  
Post Monsoon ◽  
La Nina

scholarly journals 20th century cooling of the deep ocean contributed to delayed acceleration of Earth’s energy imbalance

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
A. Bagnell ◽  
T. DeVries
Keyword(s):  
20Th Century ◽  
Heat Content ◽  
Deep Ocean ◽  
Ocean Warming ◽  
Ocean Heat Content ◽  
Global Ocean ◽  
Energy Imbalance ◽  
Delayed Onset ◽  
The Past ◽  
Historical Reconstructions

AbstractThe historical evolution of Earth’s energy imbalance can be quantified by changes in the global ocean heat content. However, historical reconstructions of ocean heat content often neglect a large volume of the deep ocean, due to sparse observations of ocean temperatures below 2000 m. Here, we provide a global reconstruction of historical changes in full-depth ocean heat content based on interpolated subsurface temperature data using an autoregressive artificial neural network, providing estimates of total ocean warming for the period 1946-2019. We find that cooling of the deep ocean and a small heat gain in the upper ocean led to no robust trend in global ocean heat content from 1960-1990, implying a roughly balanced Earth energy budget within −0.16 to 0.06 W m−2 over most of the latter half of the 20th century. However, the past three decades have seen a rapid acceleration in ocean warming, with the entire ocean warming from top to bottom at a rate of 0.63 ± 0.13 W m−2. These results suggest a delayed onset of a positive Earth energy imbalance relative to previous estimates, although large uncertainties remain.

Characterization of seawater properties and ocean heat content in Kongsfjorden, Svalbard Archipelago

2016 ◽  
Vol 27 (S1) ◽  
pp. 155-162 ◽  
Author(s):  
Stefano Aliani ◽  
Roberta Sciascia ◽  
Ilaria Conese ◽  
Alessandra D’Angelo ◽  
Fabrizio Del Bianco ◽  
...  
Keyword(s):  
Heat Content ◽  
Ocean Heat Content ◽  
Svalbard Archipelago
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