Oceanography The Official Magazine of
The Oceanography Society
Volume 32 Issue 02

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Volume 32, No. 2
Pages 86 - 97

Effects of Rainfall on the Atmosphere and the Ocean During SPURS-2

Carol Anne Clayson James B. EdsonAaron PagetRaymond GrahamBenjamin Greenwood
Article Abstract

The salinity variability of the upper ocean is influenced by surface heat, momentum, and freshwater fluxes, which are in turn affected by atmospheric conditions. It is necessary to accurately measure these surface fluxes within their atmospheric environment to understand the linkages between rain events and the resulting upper-ocean salinity balance that occurs at cloud scales. We describe a comprehensive set of atmospheric and oceanic data collected during the second Salinity Processes in the Upper-ocean Regional Study (SPURS-2) experiment in the tropical eastern Pacific Ocean. These measurements included direct estimates of heat, moisture, and momentum fluxes using direct covariance flux systems on R/V Roger Revelle and a 3 m discus buoy. These are the first successful direct measurements of evaporation from a buoy over an extended period. The atmospheric moisture budget is estimated from a combination of data, including measured freshwater fluxes, upper air sounding data, and satellite data. This analysis reconfirms the important role of moisture convergence beneath the Intertropical Convergence Zone in this region. We perform an analysis of the near-surface vertical salinity structure and its relationship to these surface fluxes, highlighting the roles of stabilization by solar insolation and precipitation and the effects of rainfall on mixing of the upper ocean.

Citation

Clayson, C.A., J.B. Edson, A. Paget, R. Graham, and B. Greenwood. 2019. Effects of rainfall on the atmosphere and the ocean during SPURS-2. Oceanography 32(2):86–97, https://doi.org/10.5670/oceanog.2019.216.

References

Adler, R.F., M. Sapiano, G.J. Huffman, J.-J. Wang, G. Gu, D. Bolvin, L. Chiu, U. Schneider, A. Beker, E. Nelkin, and others. 2018. The Global Precipitation Climatology Project (GPCP) monthly analysis (new version 2.3) and a review of 2017 global precipitation. Atmosphere 9(4):138, https://doi.org/​10.3390/atmos9040138.

Alory, G., C. Maes, T. Delcroix, N. Reul, and S. Illig. 2012. Seasonal dynamics of sea surface salinity off Panama: The far Eastern Pacific Fresh Pool. Journal of Geophysical Research 117(C4), https://doi.org/​10.1029/2011JC007802.

Banacos, P.C., and D.M. Schultz. 2005. The use of moisture flux convergence in forecasting convective initiation: Historical and operational perspectives. Weather and Forecasting 20:351–366, https://doi.org/10.1175/WAF858.1.

Bingham, F.M., V. Tsontos, A. deCharon, C.J. Lauter, and L. Taylor. 2019. The SPURS-2 eastern tropical Pacific field campaign data collection. Oceanography 32(2):142–149, https://doi.org/​10.5670/oceanog.2019.222.

Brainerd, K.E., and M.C. Gregg. 1995. Surface mixed and mixing layer depths. Deep Sea Research Part I 42:1,521–1,543, https://doi.org/​10.1016/​0967-​0637(95)00068-H.

Brown, P.J., and C.D. Kummerow. 2014. An assessment of atmospheric water budget components over tropical oceans. Journal of Climate 27(5):2,054–2,071, https://doi.org/10.1175/JCLI-D-13-00385.1.

Clayson, C.A., and J. Brown. 2016. NOAA Climate Data Record Ocean Surface Bundle (OSB) Climate Data Record (CDR) of Ocean Heat Fluxes, Version 2. Climate Algorithm Theoretical Basis Document (C-ATBD), NOAA National Center for Environmental Information, https://doi.org/10.7289/V59K4885.

Delcroix, T., and C. Henin. 1991. Seasonal and interannual variations of sea-surface salinity in the tropical Pacific ocean. Journal of Geophysical Research 96:22,134–22,150, https://doi.org/​10.1029/91JC02124.

Dominguez, F., P. Kumar, X.-Z. Liang, and M. Ting. 2006. Impact of atmospheric moisture storage on precipitation recycling. Journal of Climate 19:1,513–1,530, https://doi.org/10.1175/JCLI3691.1.

Drushka, K., W.E. Asher, A.T. Jessup, E.J. Thomson, S. Iyer, and D. Clark. 2019. Capturing fresh layers with the surface salinity profiler. Oceanography 32(2):76–85, https://doi.org/​10.5670/oceanog.2019.215.

Edson, J.B., A.A. Hinton, K.E. Prada, J.E. Hare, and C.W. Fairall. 1998. Direct covariance flux estimates from mobile platforms at sea. Journal of Atmospheric and Oceanic Technology 15:547–562, https://doi.org/10.1175/1520-0426(1998)015<0547:​DCFEFM>2.0.CO;2.

Edson, J.B., V. Jampana, R.A. Weller, S. Bigorre, A.J. Plueddemann, C.W. Fairall, S.D. Miller, L. Mahrt, D. Vickers, and H. Hersbach. 2013. On the exchange of momentum over the open ocean. Journal of Physical Oceanography 43:1,589–1,610, https://doi.org/10.1175/JPO-D-12-0173.1.

Fairall, C., E.F. Bradley, D.P. Rogers, J.B. Edson, and G.S. Young. 1996a. Bulk parameterization of air-sea fluxes for Tropical Ocean-Global Atmosphere Coupled-Ocean Atmosphere Response Experiment. Journal of Geophysical Research 101:3,747–3,764, https://doi.org/​10.1029/95JC03205.

Fairall, C.W., E.F. Bradley, J.S. Godfrey, J.B. Edson, G.S. Young, and G.A. Wick. 1996b. Cool skin and warm layer effects on the sea surface temperature. Journal of Geophysical Research 101:1,295–1,308, https://doi.org/10.1029/95JC03190.

Fairall, C.W., E.F. Bradley, J.E. Hare, A.A. Grachev, and J.B. Edson. 2003. Bulk parameterization of air-sea fluxes: Updates and verification for the COARE algorithm. Journal of Climate 16:571–591, https://doi.org/10.1175/1520-0442(2003)016​<0571:BPOASF>2.0.CO;2.

Farrar, J.T., L. Rainville, A.J. Plueddemann, W.S. Kessler, C. Lee, B.A. Hodges, R.W. Schmitt, J.B. Edson, S.C. Riser, C.C. Eriksen, and D.M. Fratantoni, 2015. Salinity and temperature balances at the SPURS central mooring during fall and winter. Oceanography 28(1):56–65, https://doi.org/​10.5670/oceanog.2015.06.

Farrar, J.T., and A.J. Plueddemann. 2019. On the factors driving upper-ocean salinity variability at the western edge of the Eastern Pacific Fresh Pool. Oceanography 32(2):30–39, https://doi.org/​10.5670/oceanog.2019.209.

Fratini, G., A. Ibrom, N. Arriga, G. Burba, and D. Papale. 2012. Relative humidity effects on water vapour fluxes measured with closed-path eddy-​covariance systems with short sampling lines. Agriculture and Forest Meteorology 165:53–63, https://doi.org/10.1016/j.agrformet.2012.05.018.

Gosnell, R., C.W. Fairall, and P.J. Webster. 1995. The sensible heat of rainfall in the tropical ocean. Journal of Geophysical Research 100:18,437–18,442, https://doi.org/​10.1029/95JC01833.

Kantha, L.H., and C.A. Clayson. 1994. An improved mixed layer model for geophysical applications. Journal of Geophysical Research 99:25,235–25,266, https://doi.org/​10.1029/94JC02257.

Kantha, L.H., and C.A. Clayson. 2004. On the effect of surface gravity waves on mixing in an oceanic mixed layer model. Ocean Modelling 6:101–124, https://doi.org/10.1016/S1463-5003(02)00062-8.

Lagerloef, G., R. Schmitt, J. Schanze, and H.-Y. Kao. 2010. The ocean and the global water cycle. Oceanography 23(4):82–93, https://doi.org/​10.5670/oceanog.2010.07.

Landwehr, S., N. O’Sullivan, and B. Ward. 2015. Direct flux measurements from mobile platforms at sea: Motion and airflow distortion corrections revisited. Journal of Atmospheric and Oceanic Technology 32:1,163–1,178, https://doi.org/10.1175/JTECH-D-14-00137.1.

Moum, J.N., S.P. deSzoeke, W.D. Smyth, J.B. Edson, H.L. DeWitt, A.J. Moulin, E.J. Thompson, C.J. Zappa, S.A. Rutledge, R.H. Johnson, and C.W. Fairall. 2014. Air-sea interactions from westerly wind bursts during the November 2011 MJO in the Indian Ocean. Bulletin of the American Meteorological Society 95:1,185–1,199, https://doi.org/10.1175/BAMS-D-12-00225.1.

Portabella, M., and A. Stoffelen. 2009. On scatterometer ocean stress. Journal of Atmospheric and Oceanic Technology 26:368–382, https://doi.org/​10.1175/2008JTECHO578.1.

Rutledge, S.A., V. Chandrasekar, B. Fuchs, J. George, F. Junyent, P. Kennedy, and B. Dolan. 2019. Deployment of the SEA-POL C-band polarimetric radar to SPURS-2. Oceanography 32(2):50–57, https://doi.org/10.5670/oceanog.2019.212.

Schudlich, R.R., and J.F. Price. 1992. Diurnal cycles of current, temperature, and turbulent dissipation in a model of the equatorial upper ocean. Journal of Geophysical Research 97:5,409–5,422, https://doi.org/​10.1029/​91JC01918.

Smyth, W.D., P.O. Zavialov, and J.N. Moum. 1997. Decay of turbulence in the upper ocean following sudden isolation from surface forcing. Journal of Physical Oceanography 27:810–822, https://doi.org/10.1175/1520-0485(1997)027<0810:DOTITU>2.0.CO;2.

Sutherland, G., G. Reverdin, L. Marie, and B. Ward. 2014. Mixed and mixing layer depths in the ocean surface boundary layer under conditions of diurnal stratification. Geophysical Research Letters 41(23):8,469–8,476, https://doi.org/​10.1002/2014GL061939.

Tomczak, M. 1995. Salinity variability in the surface layer of the tropical western Pacific Ocean. Journal of Geophysical Research 100:20,499–20,515, https://doi.org/10.1029/95JC01544.

Yuter, S.E., and R.A. Houze. 2000. The 1997 Pan American Climate Studies Tropical Eastern Pacific Process Study: Part I. ITCZ region. Bulletin of the American Meteorological Society 81:451–482, https://doi.org/10.1175/1520-0477(2000)081​<0451:TPACST>2.3.CO;2.

Zappa, C.J., D.T. Ho, W.R. McGillis, M.L. Banner, J.W.H. Dacey, L.F. Bliven, B. Ma, and J. Nystuen. 2009. Rain-induced turbulence and air-sea gas transfer. Journal of Geophysical Research 114, C07009, https://doi.org/10.1029/2008JC005008.