Intercomparison of the Gulf Stream in ocean reanalyses: 1993−2010

Chi, Lequan; Wolfe, Christopher L.; Hameed, Sultan

doi:10.1016/j.ocemod.2018.02.008

Cited by 25 publications

(21 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although longer time series of the GS metrics can be derived from numerical hindcast or future projections, it is hard to evaluate the reliability of the GS trends from those products. Chi et al (2018) found that even models constrained by observations could not reproduce most GS metrics well. It is reasonable to assume that hindcasts and climate projections without assimilating satellite SST and sea level anomaly would perform even worse.…”

Section: Detectability Of Trendsmentioning

confidence: 97%

Has the Gulf Stream Slowed or Shifted in the Altimetry Era?

Chi

Wolfe

Hameed

2021

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Detectability Of Trendsmentioning

confidence: 97%

Has the Gulf Stream Slowed or Shifted in the Altimetry Era?

Chi

Wolfe

Hameed

2021

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

show abstract

“…We make use of ocean model simulations to propagate virtual particles. OGCM for the Earth Simulator (OFES; Chi et al, ; Masumoto et al, ; Masumoto, ; Sasaki et al, ) provides a three‐dimensional flow field for the years 2000–2005 from the edge of the Antarctic continent at 75°S to 75°N with 3‐daily output. Since the model has no output north of 75°N, we only show results up to 70°N in this paper.…”

Section: Methodsmentioning

confidence: 99%

Transport Bias by Ocean Currents in Sedimentary Microplankton Assemblages: Implications for Paleoceanographic Reconstructions

Nooteboom

Bijl

Sebille

et al. 2019

Paleoceanog and Paleoclimatol

View full text Add to dashboard Cite

Microfossils from plankton are used for paleoceanographic reconstructions. An often-made assumption in quantitative microplankton-based paleoceanographic reconstructions is that sedimentary assemblages represent conditions of the directly overlying surface water. However, any immobile particle sinking down the water column is subjected to transport by three-dimensional currents, which results in a lateral relocation along transport. We model dinoflagellate cyst (dinocyst) transport in a high-resolution (0.1 • horizontally) global model of the present-day ocean and compare ocean conditions in the simulated origin of sedimentary particles to that in the directly overlying water. We find that the assumption that sedimentary particles represent the overlying surface waters is in most regions not valid. The bias induced by dinocyst transport depends on ocean current strength and direction, aggregation of particles which could increase the sinking speed, and the sediment sample depth. By using realistic sinking speeds of dinocysts and aggregates, extreme biases up to approximately ±16 • C warmer or ±4 PSU saltier are found, while other regions show lower bias from particle transport. Our model results provide a way to mechanistically and statistically explain the unexpected occurrences of some dinocyst species outside of their "normal" occurrence region, such as the northerly occurrence of the allegedly sea-ice-affiliated dinocyst Selenopemphix antarctica. Exclusion of such outlier occurrences will yield better constrained ecological affinites for dinocyst species, which has implications for microfossil-based quantitative and qualitative proxies for paleoceanographic conditions. We recommend paleoceanographers to a priori evaluate the (paleo)water depth, oceanographic setting, current strength, and particle aggregation probability for their sedimentary microplankton assemblages.

show abstract

“…This product has been successfully applied to studies in the Gulf Stream and the reliability was evaluated in Chi et al. (2018). In this work, ARMOR3D is only used to support the discussion section on interpreting the divergent EHF field in the Kuroshio Extension and Gulf Stream to produce Figure 14 in Section 5.…”

Section: Datamentioning

confidence: 99%

“…ARMOR3D is a global 3D weekly temperature, salinity, and geostrophic velocities fields at a spatial 0.25° resolution by combining satellite observed sea level anomaly, SST, and salinity data sets with in situ temperature and GUO AND BISHOP 10.1029/2021MS002863 5 of 19 salinity vertical profiles (Guinehut et al, 2012;Mulet et al, 2012;Verbrugge et al, 2017). This product has been successfully applied to studies in the Gulf Stream and the reliability was evaluated in Chi et al (2018). In this work, ARMOR3D is only used to support the discussion section on interpreting the divergent EHF field in the Kuroshio Extension and Gulf Stream to produce Figure 14 in Section 5.…”

Section: Observation-based Armor3d Productmentioning

confidence: 99%

Surface Divergent Eddy Heat Fluxes and Their Impacts on Mixed Layer Eddy‐Mean Flow Interactions

Guo

Bishop

2022

J Adv Model Earth Syst

View full text Add to dashboard Cite

In this study, the global surface divergent eddy heat flux (EHF) is estimated using remote sensing observations of sea surface height (SSH) and sea surface temperature (SST) over two decades (1993–2017). These results are used as a metric to assess model fidelity in a mesoscale eddy‐resolving version of the Community Earth System Model. The estimated EHFs show that the midlatitudes significantly contribute to the poleward transport of heat because of strong regional variability in SSH and SST. A Helmholtz decomposition is performed on the global EHFs to remove prominent nondynamic rotational wave‐like structures that appear in these fluxes. The dynamic divergent EHFs are responsible for driving cross‐frontal exchange and positive Baroclinic Conversion (BC) rates, suggesting a conversion of mean potential energy to eddy potential energy within the mixed layer. The results show that the model captures the same spatial patterns of EHFs and BC rates, but with relatively higher values in the midlatitudes than observations. The mixed layer geostrophic meridional eddy heat transport reaches maximums of 0.07 PW and 0.1 PW in the midlatitudes in the observations and climate model, respectively. The global integrated BC rate is 0.11 TW in the observations, which is ∼30% weaker than the climate model (0.16 TW). A cross‐spectral analysis further shows that the model has higher energy in low‐frequency bands for periods greater than 10 months in the northern hemisphere western boundary currents, but can capture the major spectral peaks in EHFs that are seen in observations.

show abstract

Intercomparison of the Gulf Stream in ocean reanalyses: 1993−2010

Cited by 25 publications

References 61 publications

Has the Gulf Stream Slowed or Shifted in the Altimetry Era?

Has the Gulf Stream Slowed or Shifted in the Altimetry Era?

Transport Bias by Ocean Currents in Sedimentary Microplankton Assemblages: Implications for Paleoceanographic Reconstructions

Surface Divergent Eddy Heat Fluxes and Their Impacts on Mixed Layer Eddy‐Mean Flow Interactions

Contact Info

Product

Resources

About