Comparing 20 years of precipitation estimates from different sources over the world ocean

Béranger, Karine; Barnier, Bernard; Gulev, Sergei K.; Crépon, Michel

doi:10.1007/s10236-006-0065-2

Cited by 48 publications

(20 citation statements)

References 37 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the fact that observed precipitation is larger in the northern versus southern hemisphere [1,3], further lends credence to the rainwater transport results of this model; larger values of V T lead to the mid-troposphere maximum of the zonally averaged rainwater ux moving downward. Since our solutions are linear, no direct quantitative comparison can be made.…”

Section: Resultssupporting

confidence: 58%

Moisture Transport due to Baroclinic Waves: Linear Analysis of Precipitating Quasi-Geostrophic Dynamics

Wetzel¹,

Smith²,

Stechmann³

2017

Mathematics of Climate and Weather Forecasting

View full text Add to dashboard Cite

Abstract:The e ects of rainfall speed, V T , and meridional/vertical moisture gradients on the meridional moisture transport are examined in the context of mid-latitude baroclinic waves. These e ects are investigated in an idealized model that can be solved analytically. The model is systematically derived in a precipitating quasi-geostrophic limit, starting from a moist atmospheric model with minimal representation of cloud microphysics. Single-phase dynamics are considered, with a comparison of three cases: unsaturated, saturated with V T = , and saturated with V T > . The Eady problem for linear baroclinic waves is analyzed, with modi cations to incorporate moisture. As a preliminary step, the moist waves are shown to have properties consistent with prior studies, including larger growth rates and smaller spatial scales in the saturated cases in comparison to the classic dry Eady problem. Then, in addition, it is shown that the meridional moisture ux, as a function of height, has a mid-tropospheric maximum in the case of V T = , and a maximum in the lower troposphere or at the surface for su ciently large values of V T . These results for di erent V T values are discussed in the context of meridional moisture transport in observational data.

show abstract

Section: Resultssupporting

confidence: 58%

Moisture Transport due to Baroclinic Waves: Linear Analysis of Precipitating Quasi-Geostrophic Dynamics

Wetzel¹,

Smith²,

Stechmann³

2017

Mathematics of Climate and Weather Forecasting

View full text Add to dashboard Cite

show abstract

“…These datasets represent two of the latest merged satellite/rain gauge products and are generally considered to provide a more accurate representation of global rainfall than current reanalysis products (e.g. Beranger et al 2006;Bosilovich et al 2008). …”

Section: Observational Datamentioning

confidence: 99%

Climate projections for Australia: a first glance at CMIP5

Irvine¹,

Whetton²,

Moise³

2013

AMOJ

View full text Add to dashboard Cite

“…For a given float, both the early-and late-winter measurements used to compute the spice-injection metrics of Fig. 8 OGCM with inherent biases, run without data assimilation, and forced by imperfect atmospheric fields, including a precipitation field that is highly uncertain Béranger et al 2006). Consequently, there are errors in air-sea fluxes, parameterized mixing, and large-scale flow and density structure that lead to inaccuracy in the hindcast on small scales.…”

Section: Decadal Variability Related To Winter Spice Injectionmentioning

confidence: 99%

Observational Evidence of Winter Spice Injection

Yeager

Large

2007

Journal of Physical Oceanography

View full text Add to dashboard Cite

Temperature and salinity (T-S) profiles from the global array of Argo floats support the existence of spice-formation regions in the subtropics of each ocean basin where large, destabilizing vertical salinity gradients coincide with weak stratification in winter. In these characteristic regions, convective boundary layer mixing generates a strongly density-compensated (SDC) layer at the base of the well-mixed layer. The degree of density compensation of the T-S gradients of an upper-ocean water column is quantified using a bulk vertical Turner angle (Tu b ) between the surface and upper pycnocline. The winter generation of the SDC layer in spice-formation zones is clearly seen in Argo data as a large-amplitude seasonal cycle of Tu b in regions of the subtropical oceans characterized by high mean Tu b . In formation regions, Argo floats provide ample evidence of large, abrupt spice injection (T-S increase on subducted isopycnals due to vertical mixing) associated with the winter increase in Tu b . A simple conceptual model of the spice-injection mechanism is presented that is based on known behavior of convective boundary layers and supported by numerical model results. It suggests that penetrative convective mixing of a partially density-compensated water column will enhance the Turner angle within a transition layer between the mixed layer and the upper pycnocline, generating seasonal T-S increases on density surfaces below the mixed layer. Observations are consistent with this hypothesis. In OGCMs, regions showing high Tu b mean and seasonal amplitude are also the sources of significant interannual spice variability in the permanent pycnocline. Decadal changes in the North Pacific of a model hindcast simulation show qualitative resemblance to the observed multiyear time series from the Hawaii Ocean Time series (HOT) station ALOHA. Modeled pycnocline variations near Hawaii can be linked to high Tu b seasonality and winter spice injection within a formation region upstream of ALOHA, suggesting that spice injection may explain the origins of observed large, interannual variations on isopycnals in the ocean interior.

show abstract

Comparing 20 years of precipitation estimates from different sources over the world ocean

Cited by 48 publications

References 37 publications

Moisture Transport due to Baroclinic Waves: Linear Analysis of Precipitating Quasi-Geostrophic Dynamics

Moisture Transport due to Baroclinic Waves: Linear Analysis of Precipitating Quasi-Geostrophic Dynamics

Climate projections for Australia: a first glance at CMIP5

Observational Evidence of Winter Spice Injection

Contact Info

Product

Resources

About