Prytherch John

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Prytherch
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  • Article
    Moored surface buoy observations of the diurnal warm layer
    (John Wiley & Sons, 2013-09-13) Prytherch, John ; Farrar, J. Thomas ; Weller, Robert A.
    An extensive data set is used to examine the dynamics of diurnal warming in the upper ocean. The data set comprises more than 4700 days of measurements at five sites in the tropics and subtropics, obtained from surface moorings equipped to make comprehensive meteorological, incoming solar and infrared radiation, and high-resolution subsurface temperature (and, in some cases, velocity) measurements. The observations, which include surface warmings of up to 3.4°C, are compared with a selection of existing models of the diurnal warm layer (DWL). A simple one-layer physical model is shown to give a reasonable estimate of both the magnitude of diurnal surface warming (model-observation correlation 0.88) and the structure and temporal evolution of the DWL. Novel observations of velocity shear obtained during 346 days at one site, incorporating high-resolution (1 m) upper ocean (5–15 m) acoustic Doppler current profile measurements, are also shown to be in reasonable agreement with estimates from the physical model (daily maximum shear model-observation correlation 0.77). Physics-based improvements to the one-layer model (incorporation of rotation and freshwater terms) are discussed, though they do not provide significant improvements against the observations reported here. The simplicity and limitations of the physical model are used to discuss DWL dynamics. The physical model is shown to give better model performance under the range of forcing conditions experienced across the five sites than the more empirical models.
  • Article
    Supplement to physical exchanges at the air–sea interface : UK–SOLAS field measurements
    (American Meteorological Society, 2009-05) Brooks, Ian M. ; Yelland, Margaret J. ; Upstill-Goddard, Robert C. ; Nightingale, Philip D. ; Archer, Stephen D. ; D'Asaro, Eric A. ; Beale, Rachael ; Beatty, Cory ; Blomquist, Byron ; Bloom, A. Anthony ; Brooks, Barbara J. ; Cluderay, John ; Coles, David ; Dacey, John W. H. ; DeGrandpre, Michael D. ; Dixon, Jo ; Drennan, William M. ; Gabriele, Joseph ; Goldson, Laura E. ; Hardman-Mountford, Nick ; Hill, Martin K. ; Horn, Matt ; Hsueh, Ping-Chang ; Huebert, Barry ; De Leeuw, Gerrit ; Leighton, Timothy G. ; Liddicoat, Malcolm ; Lingard, Justin J. N. ; McNeil, Craig L. ; McQuaid, James B. ; Moat, Bengamin I. ; Moore, Gerald ; Neill, Craig L. ; Norris, Sarah J. ; O'Doherty, Simon ; Pascal, Robin W. ; Prytherch, John ; Rebozo, Mike ; Sahlee, Erik ; Salter, Matt ; Schuster, Ute ; Skjelvan, Ingunn ; Slagter, Hans ; Smith, Michael H. ; Smith, Paul D. ; Srokosz, Meric ; Stephens, John A. ; Taylor, Peter K. ; Telszewski, Maciej ; Walsh, Roisin ; Ward, Brian ; Woolf, David K. ; Young, Dickon ; Zemmelink, Hendrik J.
  • Article
    Physical exchanges at the air–sea interface : UK–SOLAS field measurements
    (American Meteorological Society, 2009-05) Brooks, Ian M. ; Bloom, A. Anthony ; Brooks, Barbara J. ; Lingard, Justin J. N. ; McQuaid, James B. ; Norris, Sarah J. ; Smith, Michael H. ; Smith, Paul D. ; Yelland, Margaret J. ; Moat, Bengamin I. ; Pascal, Robin W. ; Prytherch, John ; Srokosz, Meric ; Taylor, Peter K. ; Upstill-Goddard, Robert C. ; Salter, Matt ; Nightingale, Philip D. ; Archer, Stephen D. ; Beale, Rachael ; Dixon, Jo ; Goldson, Laura E. ; Hardman-Mountford, Nick ; Liddicoat, Malcolm ; Moore, Gerald ; Stephens, John A. ; D'Asaro, Eric A. ; McNeil, Craig L. ; Beatty, Cory ; DeGrandpre, Michael D. ; Blomquist, Byron ; Huebert, Barry ; Cluderay, John ; Zemmelink, Hendrik J. ; Coles, David ; Hsueh, Ping-Chang ; Leighton, Timothy G. ; Dacey, John W. H. ; Drennan, William M. ; Rebozo, Mike ; Sahlee, Erik ; Gabriele, Joseph ; Hill, Martin K. ; Horn, Matt ; De Leeuw, Gerrit ; Neill, Craig ; Skjelvan, Ingunn ; O'Doherty, Simon ; Walsh, Roisin ; Young, Dickon ; Schuster, Ute ; Telszewski, Maciej ; Slagter, Hans ; Ward, Brian ; Woolf, David K.
    As part of the U.K. contribution to the international Surface Ocean–Lower Atmosphere Study, a series of three related projects—DOGEE, SEASAW, and HiWASE—undertook experimental studies of the processes controlling the physical exchange of gases and sea spray aerosol at the sea surface. The studies share a common goal: to reduce the high degree of uncertainty in current parameterization schemes. The wide variety of measurements made during the studies, which incorporated tracer and surfactant release experiments, included direct eddy correlation fluxes, detailed wave spectra, wind history, photographic retrievals of whitecap fraction, aerosol-size spectra and composition, surfactant concentration, and bubble populations in the ocean mixed layer. Measurements were made during three cruises in the northeast Atlantic on the RRS Discovery during 2006 and 2007; a fourth campaign has been making continuous measurements on the Norwegian weather ship Polarfront since September 2006. This paper provides an overview of the three projects and some of the highlights of the measurement campaigns.