Observed cloud anomalies associated with the North Atlantic Oscillation and their radiative feedback
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1 Observed cloud anomalies associated with the North Atlantic Oscillation and their radiative feedback 1, Aiko Voigt 1,2, Peter Knippertz 1 ¹Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany ²Lamont-Doherty Earth Observatory, Columbia University, New York, USA Institute NAME of Meteorology OF INSTITUTE, and FACULTY, Climate Research DEPARTMENT - Department (change Troposphere master view) Research () Please insert a figure in the master transparency. KIT University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association
2 Anomalous cloud-radiative effects damp the NAO Li et al., 2016!
3 Anomalous cloud-radiative effects damp the NAO Li et al., 2016!
4 !
5 What is the impact of the cloud-radiative effects on the NAO?!
6 What is the impact of the cloud-radiative effects on the NAO?!
7 What is the impact of the cloud-radiative effects on the NAO? Analyze 5-day mean data: CloudSat/CALIPSO CERES-Syn1deg ERA-Interim reanalysis & forecasts!
8 Observational datasets CloudSat CALIPSO Aqua!4
9 High-level cloud incidence climatology Clim!
10 High-level cloud incidence climatology Clim!
11 Cloud anomalies associated with positive NAO+ *Stippling shows non-statistically significant grid points!
12 Cloud anomalies associated with positive NAO+ *Stippling shows non-statistically significant grid points!
13 Cloud anomalies associated with positive NAO+ *Stippling shows non-statistically significant grid points!
14 Cloud anomalies associated with positive NAO+ *Stippling shows non-statistically significant grid points!
15 Cloud anomalies associated with positive NAO+ data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
16 Cloud anomalies associated with positive NAO+ data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
17 Cloud anomalies associated with positive NAO+ data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
18 Cloud anomalies associated with positive NAO+ ICELAND data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
19 Cloud anomalies associated with positive NAO+ ICELAND data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
20 Cloud anomalies associated with positive NAO+ ICELAND AZORES data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
21 Cloud anomalies associated with positive NAO+ ICELAND AZORES data: CERES-SYN1deg data: CloudSat/CALIPSO *Stippling shows non-statistically significant grid points!
22 Vertical profiles of the anomalies associated with NAO Data: CloudSat/CALIPSO!
23 Vertical profiles of the anomalies associated with NAO Data: CloudSat/CALIPSO!
24 Vertical profiles of the anomalies associated with NAO Data: CloudSat/CALIPSO!
25 Vertical profiles of the anomalies associated with NAO!
26 CRE anomalies are robust across different datasets!
27 Surface Pressure Tendency perspective Knippertz & Fink, 2008 Fink et al., 2012!
28 Surface Pressure Tendency perspective Knippertz & Fink, 2008 Fink et al., 2012!
29 Surface Pressure Tendency perspective Knippertz & Fink, 2008 Fink et al., 2012!
30 Surface Pressure Tendency perspective Knippertz & Fink, 2008 Fink et al., 2012!
31 Schematic illustration of the PTE Fink et al., 2012!
32 Schematic illustration of the PTE Fink et al., 2012!
33 Schematic illustration of the PTE Fink et al., 2012!
34 Schematic illustration of the PTE Fink et al., 2012!
35 Surface Pressure Tendency analysis!
36 Surface Pressure Tendency analysis!
37 Surface Pressure Tendency analysis!
38 Surface Pressure Tendency analysis!
39 Cloud-radiative effects damp the NAO+ TOTAL DIABATICS CRE Data: ERA-Interim!
40 Summary The changes in clouds associated with the NAO lead to substantial changes in cloud-radiative effects which leads to a heating dipole in the N. Atlantic region. The heating dipole suggests that the anomalous CRE associated with the NAO have a negative feedback on the NAO timescale from the perspective of the surface pressure tendency equation.!
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