A5070892427- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
- Marine Biology and Ecology Research
- Underwater Acoustics Research
- Geophysics and Gravity Measurements
- Climate variability and models
- Air Quality Monitoring and Forecasting
- Geological Studies and Exploration
- Tropical and Extratropical Cyclones Research
- Scientific Research and Discoveries
University of Alaska Fairbanks
2020-2022
Scripps Institution of Oceanography
2019-2022
University of California, San Diego
2019
University of Washington
2014-2016
Surface and subsurface moored buoy, ship-based, remotely sensed, reanalysis datasets are used to investigate thermal variability of northern Gulf Alaska (NGA) nearshore, coastal, offshore waters over synoptic century-long time scales. NGA sea surface temperature (SST) showed a larger positive trend 0.22 ± 0.10 °C per decade 1970–2021 compared 0.03 1900–2021. Over scales, SST covariance between two stations is small (<10%) when separation exceeds 100 km, while separated by 500 km retain 50%...
Abstract We employ profiling floats with dissolved oxygen sensors to observe in situ temporal evolution below the mixed layer, allowing us characterize net respiration of organic carbon eight distinct regions over globe. Export and export efficiency are generally high locations strong seasonal variability low weak seasonality. Vertically integrated is weakly, yet significantly, correlated remote observations chlorophyll, primary production, planktonic community size structure. These...
Data from coastal tide gauges, oceanographic moorings, and a numerical model show that Arctic storm surges force continental shelf waves (CSWs) dynamically link the circumpolar system. These trains of barotropic disturbances result convergences driven by cross-shelf Ekman transport. Observed propagation speeds 600-3000 km day-1, periods 2-6 days, wavelengths 2000-7000 km, elevation maxima near coast but velocity upper slope are all consistent with theoretical CSW characteristics. Other, more...
Abstract This study examines the global variability of internal wave field near a depth 1000 m using data from set 194 Argo floats equipped with Iridium communications, capable measuring hourly temperature and pressure during park phase their 10-day cycles. These have been used to estimate vertical isotherm displacements at intervals, yielding measure heaving due gravity waves. The displacement results employed examine these waves how power spectrum compares canonical Garrett–Munk spectrum....
Abstract Despite sufficient wind forcing, internal waves in the South China Sea do not exhibit strong near-inertial wave (NIW) peak that is typical most of world oceans. Using data from 10 contemporaneous moorings deployed summer 2011, we show isopycnal vertical tidal displacements transfer (NI) kinetic energy (KE) to frequencies higher than inertial frequency an Eulerian reference frame. Transforming isopycnal-following frame increases KE at NI frequencies, suggesting presence NIWs....
Abstract In situ nutrient concentration data and salinity‐nutrient parameterizations established at Anadyr Strait from June 2017 to 2018 are used estimate monthly Pacific‐to‐Arctic fluxes of nitrate, phosphate, silicate through Bering over 1997–2019. most months our estimates rely on measurements made mooring‐based sensors whole water samples, while May–August the basis is shipboard hydrography. We find annually averaged 16 ± 6, 1.5 0.5, 30 11 kmol/s for silicate, respectively, with...
Abstract The Epsilometer (“epsi”) is a small (7 cm diameter × 30 long), low-power (0.15 W), and extremely modular microstructure package measuring thermal kinetic energy dissipation rates, χ ε . Both the shear probes FP07 temperature sensors are fabricated in house following techniques developed by Michael Gregg at Applied Physics Laboratory/University of Washington (APL/UW). Sampling eight channels (two shear, two temperature, three-axis accelerometer, spare for future sensors) 24 bit...
Abstract Internal waves are predominantly generated by winds, tide/topography interactions and balanced flow/topography interactions. Observations of vertical shear horizontal velocity ( u z , v ) from LADCP profiles conducted during GO-SHIP hydrographic surveys, as well vessel-mounted sonars, used to interpret these signals. Vertical directionality intermediate-wavenumber [λ ~ 𝒪(100 m)] internal is inferred in this study rotary-with-depth shears. Total variance asymmetry ratio (Ω), i.e. the...
Abstract Though unresolved by Argo floats, internal waves still impart an aliased signal onto their profile measurements. Recent studies have yielded nearly global characterization of several constituents the stationary tides. Using this new information in conjunction with thousands we quantify influence stationary, mode-1 M 2 and S tides on Argo-observed temperature. We calculate situ temperature anomaly observed floats (usually order 0.1°C) compare it to expected from derived altimetry....