A5021139861- Oceanographic and Atmospheric Processes
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Water Quality Monitoring and Analysis
- Geological Studies and Exploration
- Ocean Acidification Effects and Responses
- Geological and Geochemical Analysis
- Marine and fisheries research
- Geological and Tectonic Studies in Latin America
- Underwater Vehicles and Communication Systems
- Seismic Waves and Analysis
- Atmospheric and Environmental Gas Dynamics
- Underwater Acoustics Research
- Marine Biology and Ecology Research
- Ocean Waves and Remote Sensing
- Geomagnetism and Paleomagnetism Studies
- Coastal and Marine Management
- Environmental Monitoring and Data Management
Dalhousie University
2020-2024
NOAA Pacific Marine Environmental Laboratory
2024
Scripps Institution of Oceanography
2017-2020
University of California, San Diego
2018-2020
The Atlantic Meridional Overturning Circulation (AMOC) extends from the Southern Ocean to northern North Atlantic, transporting heat northwards throughout South and sinking carbon nutrients into deep ocean. Climate models indicate that changes AMOC both herald drive climate shifts. Intensive trans-basin observational systems have been put in place continuously monitor meridional volume transport variability, some cases, heat, freshwater transport. These programs used diagnose magnitude...
Abstract. The Labrador Sea in the North Atlantic Ocean is one of few regions globally where oxygen from atmosphere can reach deep ocean directly. This result wintertime convection, which homogenizes water column to a depth up 2000 m and brings undersaturated into contact with atmosphere. In this study, we analyze how intense uptake during Water (LSW) formation affects properties outflowing western boundary current, ultimately feeds upper part Deep layer much Ocean. Seasonal cycles...
Abstract Measurements of near‐surface oxygen (O 2 ) concentrations and mixed layer depth from the K1 mooring in central Labrador Sea are used to calculate change column‐integrated (0–1700 m) O content over deep convection winter 2014/2015. During deepening period, November 2014 April 2015, increased by 24.3 ± 3.4 mol m −2 , 40% higher than previous results winters with weaker convection. By estimating contribution respiration lateral transport on budget, cumulative air‐sea gas exchange is...
Abstract The meridional overturning circulation (MOC) has been measured by boundary arrays in the Atlantic since 2000. Over past decade of measurements, however, reported tendencies strength have differed between 16°N and 26°N. Here we investigate these differences diagnosing their origin observed hydrography, finding that both show deep waters (below 1,100 dbar) at western becoming fresher less dense. associated change geopotential thickness is about 0.15 m 2 s −2 2004–2009 2010–2014, with...
Abstract The Gravity Recovery and Climate Experiment (GRACE) satellite mission provides information on changes to the Earth's gravity field, including ocean mass. Long‐term trends in GRACE data are often considered unreliable due uncertainties corrections made calculate mass from raw measurements. Here, we use an independent estimate of altimetry situ density five mooring sites repeat hydrography validate over North Atlantic, finding substantial agreement between methods. root‐mean‐square...
The aragonite saturation state (ΩAr) in the subpolar North Atlantic was derived using new regional empirical algorithms. These multiple regression algorithms were developed bin-averaged GLODAPv2 data of commonly observed oceanographic variables (temperature (T), salinity (S), pressure (P), oxygen (O2), nitrate (NO3-), phosphate (PO4-3), silicate (Si(OH)4), and pH). Five these are also frequently autonomous platforms, which means they widely available. validated against independent shipboard...
Abstract Variability of the flow across Solomon Sea's southern entrance was examined using end point subsurface moorings and seafloor pressure sensors, reconstructed velocity profiles based on satellite‐derived surface bottom pressure‐derived velocity, 1993–2017 proxy volume transport satellite altimetry. The correctly represents fluctuating core providing a high‐frequency continuous observing system for this sea. mean equatorward over 0‐ to 500‐m depth layer is 15.2 Sv (1 ≡ 10 6 m 3 /s)...
The uptake of dissolved oxygen from the atmosphere via air-sea gas exchange and its physical transport away region are crucial for supplying to deep ocean. This process takes place in a few key regions that feature intense uptake, water formation, export. In this study we analyze one such region, Labrador Sea, utilizing World Ocean Database (WOD) construct 65–year content time series Sea Water (LSW) layer (0–2200 m). data reveal decadal variability associated with strength convection,...
The subpolar North Atlantic (SPNA) is one of the few regions where deep ocean in direct contact with atmosphere, making it a key location for interior ventilation through gas exchange. We use observational data to analyze large-scale patterns mean annual air-sea flux, biological production and consumption, physical transport oxygen Ocean (45N-65N), finding net flux 48.1±14.6 Tmol (1Tmol = 1012 mol) from atmosphere into ocean, largely balanced by removal transport. Wintertime increases...
Increasing interest in the deployment of optical oxygen sensors, or optodes, on oceanographic moorings reflects value dissolved (DO) measurements studies physical and biogeochemical processes. Optodes are well-suited for moored applications but require careful, multi-step calibrations field to ensure data accuracy. Without a standardized set protocols, this can be an obstacle science teams lacking expertise optode processing calibration. Here, we provide recommendations situ calibration from...
Abstract. The Labrador Sea in the North Atlantic Ocean is one of few regions globally where oxygen from atmosphere can reach deep ocean directly. This result wintertime convection, which homogenizes water column to a depth up 2000 m, and brings undersaturated into contact with atmosphere. In this study, we analyze how intense uptake during Water (LSW) formation affects properties outflowing western boundary current, ultimately feeds upper part Deep layer much Ocean. Seasonal cycles...
In situ boundary arrays have been installed in the North Atlantic to measure large-scale ocean circulation. Here, we use measurements at western edge of $16^\circ$N and $26^\circ$N investigate low-frequency variations deep densities their associated influence on transports. At both latitudes, waters (below 1100 dbar) are becoming fresher less dense. The change geopotential thickness is about $0.15$ $\mbox{m}^2\mbox{s}^{-2}$ between 2004-2009 2010-2014, with shift occurring 2009-2010 earlier...
<p>The Labrador Sea is one of the few regions where ventilation can replenish oxygen to deep ocean, owing wintertime convection that occurs primarily in center basin. While some recent studies have aided quantifying amount taken up during Water (LSW) formation, less known about how different spreading pathways LSW contribute export oxygen.</p><p>In this study, we use data from 53N mooring array boundary current at exit Sea, together with Argo float...
<div> <p>Most of the life-sustaining oxygen found in global deep ocean is supplied one only a handful key regions around globe, such as Labrador Sea subpolar North Atlantic. Here, directly to during formation Water (LSW), when convective mixing continuously brings low-oxygen water towards surface and into contact with atmosphere. The continuous exchange between convection can bring newly oxygenated waters 2000m. Although associated uptake has been observed...