<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">In the Southern Ocean (and probably the Arctic too) we often see temperature restratification lagging behind freshwater restratification. Basically initial spring/summer warming is absorbed by the latent heat of melting ice. The water column freshens at the surface but the temperature doesn’t start increasing until much of the ice has melted. I forget the lag time, but it can be something like weeks. Thus the water column has restratified but the T threshold wouldn’t record it until the ice was mostly gone <div class=""><br class=""></div><div class="">Matt</div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On May 2, 2017, at 8:11 PM, Menemenlis, Dimitris (329C) <<a href="mailto:Dimitris.Menemenlis@jpl.nasa.gov" class="">Dimitris.Menemenlis@jpl.nasa.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Hi Martha, I don’t remember exactly why it is that we run into trouble with the Kara MLD definition in polar regions.
<div class="">As you say below, .8 deg C corresponds to a much smaller (factor of 5 to 10) deltaRho in ice-covered oceans,</div>
<div class="">and maybe that’s what caused trouble.</div>
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<div class="">On May 2, 2017, at 6:35 PM, Martha Buckley <<a href="mailto:marthabuckley@gmail.com" class="">marthabuckley@gmail.com</a>> wrote:</div>
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<div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Thanks
for pointing this out Dimitris. Is this because the variable nature of the density criteria is based on the thermal expansion coefficient, so one choses too small of a threshold in these regions? I guess using a variable density criteria is supposed to help
remove deep biases in cold regions, but if it messes up regions that have a halocline, this isn't desirable. What do you recommend using as a MLD criteria in polar regions?</span>
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thanks,</div>
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Martha</div>
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