ANGWIN History Mike J. Taylor, Takuji Nakamura, Tracy - PowerPoint PPT Presentation

ANGWIN History Mike J. Taylor, Takuji Nakamura, Tracy Moffat-Griffin, Hisao Takahashi, Damian Murphy, Jeong-Han Kim, Pierre- Dominique Pautet, Mitsumu Ejiri, Yucheng Zhao, Jose- Valentin Bageston, C. Wrasse, and ANGWIN Colleagues ANGWIN: “ ANtarctic Gravity Wave Instrument Network” 4 th International ANGWIN Workshop, Sao Jose dos Campos, Brazil, 24-26 April, 2018

Early Antarctic OH Observations All-sky Camera 2000-to date ? Wealth of GW South activity over Pole Antarctica! • Collaborative NSF program with British Antarctic Survey BAS) to investigate short-period gravity wave climatology over Antarctica. • All sky Multi-wavelength CCD camera measuring mesospheric OH, Na, O 2 emissions. 19 Winter Seasons of observations: • 4 at Halley (75.5  S) 2000,2001,2005 & 2006. • 15 at Rothera (67  S) 2002-2004, & 2007-to date

ANGWIN Concept and Goals • ANGWIN is a “scientist driven” concept that was designed to develop a network of Antarctic gravity wave observatories • Operated by different nations working together in a spirit of close scientific collaboration. Goals: • Goal: To measure and understand large-scale climatology and effects of mesospheric gravity waves on the MLT region over Antarctica • Utilize existing Antarctic Research stations and a broad range of complementary measurements and new modeling capabilities.

International ANGWIN Instrument Network, 2012 Collaborating institutes from: USA, Japan, UK, Australia , Brazil… Goal: To measure and understand large-scale climatology and effects of mesospheric gravity waves over Antarctica

ANGWIN “OH Imager” Network (2012) Halley All-sky IR Imager Davis McMurdo Three new IR imagers deployed early in 2012, and first winter season coordinated data from 7 cameras around the continent

Examples of IR All-sky OH Data: Davis, Halley & McMurdo Davis Halley McMurdo Observing window Add to existing imagers at Rothera, Syowa, South Pole, and Ferraz

1 st International ANGWIN Workshop, NIPR, Japan, March, 2013

ANGWIN: General Research Interests • BAS: stratosphere-mesosphere wave coupling and sources at Halley and Rothera. Development of a ship-borne OH imager • NIPR: multi-instruments measurements at Syowa for wave propagation, momentum deposition and wave source studies using cluster of instruments, including the new PANSY radar. • AAD: ray-tracing source studies utilizing ANGWIN to development of Antarctic GW parameterization. • INPE: gravity waves over the Peninsula with emphasis on the Drake Passage “hot - spot” region. • USU: multi-site airglow image data to investigate pan-Antarctic wave propagation and variability. • In addition: • Develop and deploy new instrumentation to enhance the network • Include High latitude Arctic, complementary studies

Development of New Velocity Analysis Capability (Matsuda et al., JGR, 2014) A novel spectral analysis method for quantifying • the horizontal gravity wave phase velocity distribution. Very good comparison of 2011 season integrated • wave power spectrum with individually measured wave events from Syowa. • Results from 4 ANGWIN sites for selected days in April-May, 2013. Note the different levels of wave power and differing directionalities. • Day-to-day variability at a given site can be quantified during season.

2 nd International ANGWIN Workshop High-Latitude Wave Dynamics and Coupling Welcome to Logan, Utah, 1-3 October, 2014

2 nd International ANGWIN Workshop Logan, Utah, October, 2014 Scientists and graduate students from the USA, Japan, U.K., Australia, Canada, Brazil and Germany. Presentations on new ground-based, aircraft and satellite measurements and modeling studies of gravity wave dynamics and coupling in the Antarctic and Arctic regions . We thank SCOSTEP ROSMIC/ VarSITI program and the US Office of Polar Program sfor their support.

ANGWIN Sites, 2016 Halley Comandante Ferraz Palmer Rothera Syowa South Pole Davis McMurdo Jang Bogo McMurdo

3 rd ANGWIN Meeting: 33 delegates at the meeting from 10 different countries

New ANGWIN website (www.bas.ac.uk/projects/angwin) New ANGWIN JGR Special section (Atmospheres and Space Sciences, 2018)

Evolving ANGWIN Objectives 2018… • The primary objectives of the network will be to: • Quantify the longitudinal variation in gravity wave activity from the lower atmosphere into the mesosphere and lower thermosphere at polar latitudes and determine causes. • Characterize the propagation and dynamical influence of mountain waves on stratosphere and MLT dynamics. • Relate gravity waves observed in the stratosphere, mesosphere and thermosphere to sources such as storms in the Drake’s Passage and Southern Ocean, auroral activity or the polar vortex. • Study the interaction of gravity waves with global scale waves and their contribution to the polar vortex dynamical and thermal structure. • Compare observed polar gravity wave characteristics to parameterized gravity waves in climate models. • Determine the potential effects of Antarctic gravity waves on processes such as polar stratospheric cloud formation.

Hiking in Logan Canyon (2016)

We Welcome You All to the 4 th ANGWIN, Brasil, 2018!