GLEON Physics/Climate Update Jordan Read, Kohji Muraoka, David Hamilton, Evelyn Gaiser, Ian Jones etc

Plan Collect water temperature (full depth) and wind data (preferably hourly) Automate calculation of stability parameters (Schmidt Stability, Wedderburn Number, Lake Number) – a number of steps required in this Analyse for a plethora of questions on stability and episodic events (detection and severity, controls, frequency, timescales….)

Data set 15 lakes Other lakes available Denmark, Germany, Ireland, New Zealand, United Kingdom, US of A 0.09 – 600 km 2 5 – 253 m depth Different dates from 05 – 09 (approx 1 yr)

Date Timetemp0Temp1.0temp2.0temp3.5temp5.0Temp7.0Temp9.0temp11.0 7/5/ : /5/ : /5/ : /5/ : /5/ : /5/ : /5/ : /6/2007 1: /6/2007 2: °C Temp2Density (Hours assumed to be void of surface heat) NightTimeHours = [ ] splineFit findThermoCl Max d /dz

Thermocline depth (m) time findOutliers NightTimeHours Thermocline depth (m) Replace with running ave Full thermocline time series if d /dz < slopeCriteria break Themocline estimate metaTopSearch metaBotSearch

Metalimnion depth (m) time findOutliers Metalimnion depth (m) Replace with running ave Metalimnion depth (m) Calc 6hr running ave

Lake Taupo

Lake Annie

Lake Castle