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Tomas Chor (UCLA) - Mixing in Oceanic...

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Upcoming Seminar

Tomas Chor (UCLA) - Mixing in Oceanic Boundary Layers: A Method to Guide Model Development

Wed, Jun 3, 2020

Zoom Seminar

Surface oceanic boundary layers are critical for earth dynamics because they mediate fluxes of important properties (such as momentum, heat and dissolved gases) between the atmosphere and the ocean. These dynamics are dominated by flow structures that range from millimeters to hundreds of meters and are therefore too small to be accurately resolved by global models and need to be parameterized. We focus on a class of eddy diffusivity models known as K-profile parameterization (KPP) in the oceanic community. This model aims to represent turbulent fluxes by separating them into a diffusive and a nondiffusive component. Many different versions of KPP exist and the greatest disparity between them is the way that surface waves modify these profiles. One of the issues is that oceanographers do not know how the diffusive/nondiffusive separation should change with different wave conditions, which is mainly due to the challenge of estimating both components of the flux separately directly from data.

In order to bridge this gap, we introduce a method that estimates this separation of fluxes for KPP based on data alone (i.e. without needing any a priori assumptions of shape or scaling). We use this method to investigate how the fluxes should be partitioned between diffusive and nondiffusive components across a wide range of oceanic regimes, which can be used to modify KPP in an informed manner and thus reduce the huge disparity between its versions in the community. Our results indicate that it is possible to successfully include wave effects in KPP in a very straightforward manner if the shape of the profiles is modified from the one currently used by models. Furthermore we also show that some modifications are needed in the magnitudes of these profiles to more accurately represent observed fluxes.

Adeyemi Adebiyi	Postdoctoral Scholar	aadebiyi [at] ucla.edu
Fiaz Ahmed	Assistant Project Scientist
Xin An	Postdoctoral Scholar	xinan [at] atmos.ucla.edu
Homayon Aryan	Associate researcher	homayonaryan [at] atmos.ucla.edu
Roy Bakarn	Assistant Researcher
Neil Berg	Assistant Researcher	nberg [at] atmos.ucla.edu
Mickael D. Chekroun	Associate researcher	mchekroun [at] atmos.ucla.edu
Bicheng Chen	Postdoctoral Scholar
Seth Claudepierre	Associate researcher	sethclaudepierre [at] atmos.ucla.edu
Santo Fedele Colosimo	Assistant Researcher	fedele [at] atmos.ucla.edu
Daniel Dauhajre	Postdoctoral Scholar
Charles Dong	Research Professor	cdong [at] atmos.ucla.edu
Amir Erfanian	Postdoctoral Scholar
Xingying Huang	Postdoctoral Scholar
Delphine Hypolite	Postdoctoral Scholar
Arjun Jagannathan	Postdoctoral Scholar
Heejeong Kim	Assistant Researcher	heekim [at] atmos.ucla.edu	MS 7115
Dmitri Kondrashov	Researcher	dkondras [at] atmos.ucla.edu	MS 7232
Jinxing Li	Postdoctoral Scholar	jli [at] atmos.ucla.edu
Wen Li	Associate researcher	moonli [at] atmos.ucla.edu	MS 7984
Marianna Linz	Postdoctoral Scholar	mlinz [at] ucla.edu
Qianli Ma	Assistant Researcher	qianlima [at] atmos.ucla.edu
Cristian Martinez-Villalobos	Postdoctoral Scholar	cmartinezvil [at] atmos.ucla.edu
Jeroen Molemaker	Associate researcher	nmolem [at] atmos.ucla.edu
Yukitoshi Nishimura	Associate researcher	toshi [at] atmos.ucla.edu	MS 7115
Jesse Norris	Project Scientist	jessenorris [at] ucla.edu	MS 7235
Olga Pikelnaya	Assistant Researcher	olga [at] atmos.ucla.edu
Lionel Renault	Assistant Researcher
Kaushik Srinivasan	Assistant Researcher	kaushiks [at] ucla.edu
Wu Sun	Postdoctoral Scholar	wu.sun [at] ucla.edu
Yoshihide Takano	Project Scientist	ytakano [at] atmos.ucla.edu	GE B691
Chad Thackeray	Postdoctoral Scholar
Chih-Ping Wang	Researcher	cat [at] atmos.ucla.edu	MS 7115
Peng Wang	Postdoctoral Scholar
Mary Whelan	Postdoctoral Scholar
Chao Yan	Postdoctoral Scholar	yanchao11 [at] tsinghua.org.cn
Simon Yang	Assistant Project Scientist	yangsi [at] ucla.edu
Huang Yang	Postdoctoral Scholar
Xinxin Ye	Postdoctoral Scholar
Chao Yue	Assistant Researcher	yuechao [at] atmos.ucla.edu
Pengfei Zhang	Postdoctoral Scholar	zpengfei [at] atmos.ucla.edu

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