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USING ALTIMETRY, GRACE AND ARGO TO ASSESS STATIONARY CIRCULATION AND TRANSPORTS IN THE NORTH ATLANTIC

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USING ALTIMETRY, GRACE AND ARGO TO ASSESS STATIONARY

CIRCULATION AND TRANSPORTS IN THE NORTH ATLANTIC

F. Richter, D.Sidorenko, J. Schröter

Alfred-Wegener-Institut, Bremerhaven, Germany

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20.07.2010 F. Richter, D.Sidorenko, J. Schröter 2

Introduction

● combining an ocean circulation model with measurements could help to reduce the errors in both

● Argo profiling buoys provide a large data set of in-situ temperature (T) and salinity (S) measurements

● the high correlation between steric height (from Argo) and sea surface elevation (from altimetry) is shown in different studies (e.g., Guinehut et al., 2006, 2009 or Ivchenko et al., 2007) and due to the consistency in information content the combination of these two data sets is recommended

● the combination of Argo and altimetry within the ocean

circulation model allows the analyses of measured (T, S, SSH) and dynamical consistently derived properties (u, v, w)

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Argo data

T S

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20.07.2010 F. Richter, D.Sidorenko, J. Schröter 4

Aviso altimetry

SSH σ

SSH

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Model

The Inverse Finite Element Ocean model (IFEOM, Sidorenko 2005) solves for T and S that are close to measurements, respects stationary dynamical balances, and simultaneously produces estimates of the

circulation.

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20.07.2010 F. Richter, D.Sidorenko, J. Schröter 6

Why we need altimetry?

● altimetry helps to spread the Argo point measurement

horizontally in the model domain

●Argo provides the vertical

information on how to change T and S to fit altimetry

Argo only

altimetry + Argo temperature sections

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section (36°N) of temperature difference

vertical T and S profile from Argo

Alt - Ref.

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20.07.2010 F. Richter, D.Sidorenko, J. Schröter 8

Meridonal heat-transport across section 24°N:

Referenzlauf 0.92 PW

Argo 0.92 PW

AltArgo 1.19 PW

Lumpkin und Speer (2003) 1.17 PW Lumpkin et al. (2008) 1.24 PW

Ganachaud und Wunsch (2000) 1.26 PW (1 PW=1015 W)

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Changes in SSH due to inversion

● the inversion changes the Aviso dynamic topography towards the product presented by Wolfgang Bosch (Bosch W. and Savcenko R. (200[89]),

accepted)

Difference of time-averaged SSH (2004-2007)

AltArgo - aviso “Bosch and Savcenko” - aviso

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20.07.2010 F. Richter, D.Sidorenko, J. Schröter 10

key - results

●

Argo and altimetry provide consistent information

●

altimetry improves the estimates of circulation and transports

●

Argo contributes the vertical profile of how to

change steric component necessary to fit altimetry

●

altimetry data helps to propagate Argo T and S profile

measurements (spreading Argo information)

Referenzen

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