0 WACCM - X and the August 21, 2017 Great American Eclipse Joe McInerney, Dan Marsh, Hanli Liu, Stan Solomon, Andrew Conley National Center for Atmospheric Research Boulder, Colorado Doug Drob Space Science Division Naval Research Laboratory Washington, DC CESM WAWG • Boulder, Colorado • 13 February 2018
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Title SlideWACCM-X and the August 21, 2017 Great American
Eclipse
Joe McInerney, Dan Marsh, Hanli Liu, Stan Solomon, Andrew Conley National Center for Atmospheric Research
Boulder, Colorado
CESM WAWG • Boulder, Colorado • 13 February 2018
WACCM-X = CAM + WACCM + TIE-GCM
• Whole Atmosphere Community Climate Model – eXtended
• CESM 1.0.4 release in February, 2012 with vertically extended version of WACCM (WACCM-X 1.0)
• CESM 2.0 release in the spring of 2018 will include significantly improved WACCM-X (WACCM-X 2.0)
• Use WACCM-X 2.0 for whole atmosphere eclipse simulations
See H.-L. Liu et al., Journal of Advances in Modeling Earth Systems, 2018
CAM ~ 50 km
Fred Espenak, NASA/GSFC Emeritus
3
• Eclipse attenuating masks from Doug Drob at NRL — “Uniform Disk” mask – effective solar radius 1.0 — Coronal correction factor – effective solar radius 1.125 — First applied to lower atmosphere heating and second to upper
Stan Solomon, 2017
• Horizontal/vertical resolution: 1.9 x 2.5 lat x lon/0.25 Scale Height
• Free running 20 day “spin-up” simulation from August 1, 2005
conditions
• Continue on August 21st with output every time step (5 minutes)
• Eclipse simulation with the masks applied
• Baseline simulation without eclipse masks
• Each simulation for the eclipse day and two days following
• Examine differences in model output between the eclipse and
baseline simulations (Eclipse – Baseline)
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
19:00 UT -3.5oK (-6oF)
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
-1.1oK (-2oF)
19:00 UT
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
10
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
12
T Differences (Eclipse–Baseline) Applying Mask to Only Lower Atmosphere Heating
13
Mesospheric Changes in O3 and O at ~65 km
Chemistry: Ozone: O3 + hv -> O(1D) + O2 O + O2 + M -> O3 + M
O3 (Ozone) O (Atomic Oxygen)
During eclipse:
Destruction of ozone drops as production continues – O3 higher, O lower
-75% +95%
18:15 UT
Summary
17
Based on a number of ongoing and heritage modeling efforts, WACCM-X 2.0 now gives a more complete simulation of the whole atmosphere
Using this model, we conducted the first surface-to-space model simulation of the effects of the 21 August 2017 solar eclipse
Modeled eclipse effects in the ionosphere and thermosphere are not only local, but are global in nature, particularly with respect to changes in the equatorial anomalies and temperature
Good correspondence was obtained with WACCM-X and GNSS TEC measurements
WACCM-X and the August 21, 2017 Great American Eclipse
WACCM-X = CAM + WACCM + TIE-GCM
Solar Eclipse Masks
WACCM-X 2.0 Eclipse Simulations
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Near-Surface DT (Eclipse – Baseline)
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Stratopause DT (Eclipse – Baseline)
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Mesopause DT (Eclipse – Baseline)
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Slide Number 13
Slide Number 14
DNmF2 (Eclipse – Baseline)
Slide Number 17
Joe McInerney, Dan Marsh, Hanli Liu, Stan Solomon, Andrew Conley National Center for Atmospheric Research
Boulder, Colorado
CESM WAWG • Boulder, Colorado • 13 February 2018
WACCM-X = CAM + WACCM + TIE-GCM
• Whole Atmosphere Community Climate Model – eXtended
• CESM 1.0.4 release in February, 2012 with vertically extended version of WACCM (WACCM-X 1.0)
• CESM 2.0 release in the spring of 2018 will include significantly improved WACCM-X (WACCM-X 2.0)
• Use WACCM-X 2.0 for whole atmosphere eclipse simulations
See H.-L. Liu et al., Journal of Advances in Modeling Earth Systems, 2018
CAM ~ 50 km
Fred Espenak, NASA/GSFC Emeritus
3
• Eclipse attenuating masks from Doug Drob at NRL — “Uniform Disk” mask – effective solar radius 1.0 — Coronal correction factor – effective solar radius 1.125 — First applied to lower atmosphere heating and second to upper
Stan Solomon, 2017
• Horizontal/vertical resolution: 1.9 x 2.5 lat x lon/0.25 Scale Height
• Free running 20 day “spin-up” simulation from August 1, 2005
conditions
• Continue on August 21st with output every time step (5 minutes)
• Eclipse simulation with the masks applied
• Baseline simulation without eclipse masks
• Each simulation for the eclipse day and two days following
• Examine differences in model output between the eclipse and
baseline simulations (Eclipse – Baseline)
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
19:00 UT -3.5oK (-6oF)
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
-1.1oK (-2oF)
19:00 UT
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
10
0-100 km T 39N, 95W (Eclipse – Baseline) 16 to 24 UT
0-600 km
12
T Differences (Eclipse–Baseline) Applying Mask to Only Lower Atmosphere Heating
13
Mesospheric Changes in O3 and O at ~65 km
Chemistry: Ozone: O3 + hv -> O(1D) + O2 O + O2 + M -> O3 + M
O3 (Ozone) O (Atomic Oxygen)
During eclipse:
Destruction of ozone drops as production continues – O3 higher, O lower
-75% +95%
18:15 UT
Summary
17
Based on a number of ongoing and heritage modeling efforts, WACCM-X 2.0 now gives a more complete simulation of the whole atmosphere
Using this model, we conducted the first surface-to-space model simulation of the effects of the 21 August 2017 solar eclipse
Modeled eclipse effects in the ionosphere and thermosphere are not only local, but are global in nature, particularly with respect to changes in the equatorial anomalies and temperature
Good correspondence was obtained with WACCM-X and GNSS TEC measurements
WACCM-X and the August 21, 2017 Great American Eclipse
WACCM-X = CAM + WACCM + TIE-GCM
Solar Eclipse Masks
WACCM-X 2.0 Eclipse Simulations
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Near-Surface DT (Eclipse – Baseline)
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Stratopause DT (Eclipse – Baseline)
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Mesopause DT (Eclipse – Baseline)
DT 39N, 95W (Eclipse – Baseline) 16 to 24 UT
Slide Number 13
Slide Number 14
DNmF2 (Eclipse – Baseline)
Slide Number 17
Related Documents
