Veronica Tamsitt

Veronica Tamsitt
UNSW Sydney | UNSW · Climate Change Research Centre (CCRC)

21.42
 · 
PhD in Oceanography
About
16
Research items
1,600
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43
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Introduction
I am an ocean scientist interested in understanding the influence of the Southern Ocean on global climate, using ship-based observations, autonomous research platforms and geophysical models. I am currently a postdoctoral fellow at Center for Southern Hemisphere Ocean Research based in Hobart (CSHOR), working on the Southern Ocean dynamics, circulation and water mass formation project with Steve Rintoul and Matthew England. As a member of the CSHOR team I am working with state-of-the-art climate models and novel ocean observations to investigate different aspects of the Southern Ocean circulation. I am passionate about connecting science to the wider world through effective science communication, including data visualisation, public outreach and evidence-based policy.
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Projects (2)
Project
Project objectives 1. Warming in the surface Southern Ocean 2. Warming in the abyssal ocean 3. Warming over the Antarctic continental shelf 4. Carbon uptake in the Southern Ocean 5. Dynamics of the Antarctic Circumpolar Current https://cshor.csiro.au/projects/southern-ocean-dynamics-circulation-and-water-mass-formation/
Project
http://soccom.princeton.edu/ SOCCOM’s mission is to drive a transformative shift in the scientific and public understanding of the role of the vast Southern Ocean in climate change and biogeochemistry. The goals of the program are to: - Extend sparse Southern Ocean biogeochemical observations by deploying a robotic observing system composed of ~200 autonomous floats that will provide nearly continuous coverage in time and horizontal space over the entire Southern Ocean, as well as vertical coverage deep into the water column. - Using this observational data, analyze and improve a new generation of high resolution earth system models to both increase our understanding of the Southern Ocean’s current workings and make better projections of the future trajectory of the Earth’s climate and biogeochemistry. - Educate a new generation of ocean scientists trained in both ocean observation and simulation, and develop a sophisticated outreach effort to disseminate results to the broadest possible community.
Research
Research items (16)
Article
Full-text available
Upwelling of northern deep waters in the Southern Ocean is fundamentally important for the closure of the global meridional overturning circulation and delivers carbon and nutrient-rich deep waters to the sea surface. We quantify water mass transformation along upwelling pathways originating in the Atlantic, Indian, and Pacific and ending at the su...
Article
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The Ocean Observatories Initiative air-sea flux mooring deployed at 54.08°S, 89.67°W, in the southeast Pacific sector of the Southern Ocean, is the farthest south long-term open ocean flux mooring ever deployed. Mooring observations (February 2015 to August 2017) provide the first in situ quantification of annual net air-sea heat exchange from one...
Article
Full-text available
Observations show that the Atlantic Meridional Overturning Circulation (AMOC) is slowing down, and this is predicted to continue in response to climate change. This isn’t the only change expected; tracing ocean circulation within a climate model now shows that the locations where water sinks to the deep ocean to feed the AMOC will also shift in the...
Article
Full-text available
The top 2000m of the Southern Ocean has freshened and warmed over recent decades. However, the highlatitude (south of 508S) southeast Pacific was observed to be cooler and fresher in the years 2008-10 compared to 2005-07 over a wide depth range including surface, mode, and intermediate waters. The causes and impacts of this event are analyzed using...
Article
Full-text available
In the Southern Hemisphere, the ocean's deep waters are predominantly transported from low to high latitudes via boundary currents. In addition to the Deep Western Boundary Currents, pathways along the eastern boundaries of the southern Atlantic, Indian and Pacific transport deep water poleward into the Southern Ocean where these waters upwell to t...
Article
Full-text available
Air-sea and air-sea-ice fluxes in the Southern Ocean play a critical role in global climate through their impact on the overturning circulation and oceanic heat and carbon uptake. The challenging conditions in the Southern Ocean have led to sparse spatial and temporal coverage of observations. This has led to a “knowledge gap” that increases uncert...
Article
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The original version of this Article contained errors in Fig. 6. In panel a, the grey highlights obscured the curves for CESM, CM2.6 and SOSE, and the labels indicating SWIR, KP, MR, PAR, and DP were inadvertently omitted. These have now been corrected in both the PDF and HTML versions of the Article.
Article
Full-text available
Upwelling of global deep waters to the sea surface in the Southern Ocean closes the global overturning circulation and is fundamentally important for oceanic uptake of carbon and heat, nutrient resupply for sustaining oceanic biological production, and the melt rate of ice shelves. However, the exact pathways and role of topography in Southern Ocea...
Article
Submarine canyons are common features of the coastal ocean. Although they are known to be hotspots of turbulence that enhance diapycnal transport in their stratified waters, the dynamics of canyon mixing processes are poorly understood. Most studies of internal wave dynamics within canyons have focused on a handful of canyons with along-axis slopes...
Article
Full-text available
The spatial structure of the upper ocean heat budget in the Antarctic Circumpolar Current (ACC) is investigated using the 1/6°, data-assimilating Southern Ocean State Estimate (SOSE) for 2005-2010. The ACC circumpolar integrated budget shows 0.27 PW of ocean heat gain from the atmosphere and 0.38 PW heat gain from divergence of geostrophic heat tra...