Helen Macdonald

ORCID: 0000-0003-4734-3150
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About
Contact & Profiles
Research Areas
  • Oceanographic and Atmospheric Processes
  • Vitamin D Research Studies
  • Marine and coastal ecosystems
  • Bone health and osteoporosis research
  • Nutritional Studies and Diet
  • Marine and fisheries research
  • Marine Biology and Ecology Research
  • Diet and metabolism studies
  • Climate variability and models
  • Chronic Obstructive Pulmonary Disease (COPD) Research
  • Tropical and Extratropical Cyclones Research
  • Marine Bivalve and Aquaculture Studies
  • Nutrition, Genetics, and Disease
  • Obesity, Physical Activity, Diet
  • Ocean Waves and Remote Sensing
  • Vitamin C and Antioxidants Research
  • Geology and Paleoclimatology Research
  • Bone health and treatments
  • Geological formations and processes
  • Atmospheric and Environmental Gas Dynamics
  • Cancer Risks and Factors
  • Stress Responses and Cortisol
  • Consumer Attitudes and Food Labeling
  • Bone Metabolism and Diseases
  • COVID-19 Clinical Research Studies

National Institute of Water and Atmospheric Research
2018-2025

BMJ Group (United Kingdom)
2018-2022

Florey Institute of Neuroscience and Mental Health
2016-2020

The University of Melbourne
2020

Austin Health
2020

Peninsula Health
2020

Eastern Health
2016-2020

Monash Health
2016-2020

Monash University
2016-2020

University of Glasgow
2016-2020

1. Determining the extent to which coastal oceanographic processes facilitate connectivity of marine organisms underpins our understanding ecology and evolution communities. Continental boundary currents are a dominant physical influence on connectivity, but determining their effect has proved elusive because difficulties in achieving replication within distribution single species. 2. Australia provides an unparalleled opportunity address such questions it three replicate narrow latitudinal...

10.1111/j.1365-2745.2011.01822.x article EN Journal of Ecology 2011-03-17

The UK Food Standards Agency (FSA) convened an international group of scientific experts to review three Agency-funded projects commissioned provide evidence for the relative contributions two sources, dietary vitamin D intake and skin exposure UVB rays from sunlight, status. This other emerging are intended inform any future risk assessment undertaken by Scientific Advisory Committee on Nutrition. Evidence was presented randomised controlled trials quantify amount required maintain a serum...

10.1017/s0007114510002138 article EN British Journal Of Nutrition 2010-06-04

Observational studies relating circulating 25-hydroxyvitamin D (25OHD) and dietary vitamin intake to cardiovascular disease (CVD) have reported conflicting results.Our objective was investigate the association of 25OHD, D, PTH, adjusted calcium with CVD mortality in a Scottish cohort.The MIDSPAN Family Study is prospective study 1040 men 1298 women from West Scotland recruited 1996 followed up for median 14.4 yr.Locally resident adult offspring general population cohort were 1972-1976.CVD...

10.1210/jc.2012-2272 article EN The Journal of Clinical Endocrinology & Metabolism 2012-10-16

The marine system plays a critical role in the global climate cycle, as major control of atmospheric carbon dioxide (CO2). Marine primary production (photosynthesis) and remineralisation organic (respiration, degradation) determine amount CO2 sequestered sediments deep-water environments on century to millennial timescales. stocks fluxes cycle are susceptible change impacts other anthropogenic activities that modify key processes. Oceanographic studies Aotearoa New Zealand's Exclusive...

10.1080/00288330.2025.2461289 article EN cc-by New Zealand Journal of Marine and Freshwater Research 2025-02-13

Abstract Using an ocean reanalysis and freely evolving numerical simulation, eddy‐driven cross‐shelf exchange in the East Auckland Current (EAuC) system was investigated. The EAuC is stronger than free run has a more evident impact on exchange. Despite differences strength, both simulations produced similar small‐eddy (radius 30 km) statistics, which supports robustness of considering that data assimilation could generate unrealistic variability. These 1‐year revealed mechanisms by its eddy...

10.1029/2024jc021601 article EN cc-by-nc-nd Journal of Geophysical Research Oceans 2025-03-01

Abstract The volume transport of nutrient‐rich continental shelf water into a cyclonic frontal eddy (entrainment) was examined from satellite observations, Slocum glider and numerical simulation outputs. Within the eddy, parcels with temperature/salinity signatures (18–19°C >35.5, respectively) were recorded. distribution patches observed within consistent spiral pattern shown simulations. A dye tracer experiment showed that surface waters (≤50 m depth) are almost entirely (≥95%) waters....

10.1002/2014jc010301 article EN Journal of Geophysical Research Oceans 2015-01-14

10.1016/j.csr.2016.01.002 article EN publisher-specific-oa Continental Shelf Research 2016-01-16

New Zealand (NZ) is an island nation with stewardship of ocean twenty times larger than its land area. While the challenges facing NZ's are similar to other maritime countries, no coherent national plan exists that meets needs scientists, stakeholders or kaitiakitanga (guardianship) in a changing climate. The NZ marine science community will use OceanObs'19 white paper establish framework and implementation for collaborative observing system (NZ-OOS). Co-production knowledge Māori be...

10.3389/fmars.2019.00143 article EN cc-by Frontiers in Marine Science 2019-03-26

Abstract Estimates of connectivity are vital for understanding population dynamics and the design spatial management areas. However, this is still a major challenge in marine environment because relative contributions factors influencing amongst subpopulations difficult to assess. This study combined genetics with hydrodynamic modelling (Regional Ocean Modeling System, ROMS) assess temporal exchange individuals among New Zealand scallop, Pecten novaezelandiae, within Coromandel fishery area...

10.1093/icesjms/fsy201 article EN ICES Journal of Marine Science 2018-12-18

A coupled physical‐biological‐chemical model is used to study the effect of upwelling‐favorable and downwelling‐favorable winds on carbon biogeochemistry continental shelf off southeast Australian mainland. Along shelf, from 30°S 34°S, winds, with aid bottom Ekman transport, bring dissolved‐inorganic‐carbon (DIC)‐rich slope waters onto increasing held in waters. For transport still lifts but water therefore held, reduced compared upwelling scenario. Under filaments DIC...

10.1029/2008jc004946 article EN Journal of Geophysical Research Atmospheres 2009-05-01

Abstract Warm‐core eddies (WCEs) often form in the meanders of Western Boundary Currents (WBCs). WCEs are frequently overwashed with less dense waters sourced from WBC. We use Regional Ocean Modelling System to investigate ocean state during overwashing one such WCE October 2008 East Australian Current (EAC). Comparisons model outputs satellite sea surface temperature and vertical profiles show that provides a realistic simulation eddy period when EAC encircled then eddy. During encircling...

10.1029/2012jc008386 article EN Journal of Geophysical Research Oceans 2012-11-20

The UK Food Standards Agency (FSA) convened a group of expert scientists to discuss and review FSA- Department Health-funded research on diet bone health. This focused the lifestyle factors that are amenable change may significantly affect health risk osteoporotic fracture. potential benefits fruits vegetables, meat, Ca, vitamins D K phyto-oestrogens were presented discussed. Other also discussed, particularly effect physical activity possible gene-nutrient interactions affecting

10.1079/bjn2003855 article EN British Journal Of Nutrition 2003-06-01

Building accurate physical-biogeochemical models of processes driving climate and eutrophication-related stressors in coastal waters is an essential step managing the impacts these stressors. Here we develop a coupled model to investigate present day for key marine ecosystem Aotearoa, New Zealand: The Hauraki Gulf/Firth Thames system. Simulation results compared well with accompanying long-term (decadal) observational dataset, indicating that captured most physical biological dynamics This...

10.3389/fmars.2023.1117794 article EN cc-by Frontiers in Marine Science 2023-06-19

Analyses are presented of model simulations and Lagrangian drifter experiments designed to quantify circulation dispersal in Tasman Golden Bays, their connection Cook Strait, New Zealand. Observations made autumn 2017 summer 2018 compared with numerical results. The were focussed on three repeat each bay measure the local horizontal eddy diffusivity. An additional experiment investigated with, flow through, Greater Strait. Point by point velocities extracted from show low correlation but...

10.1080/00288330.2019.1698622 article EN New Zealand Journal of Marine and Freshwater Research 2019-12-11

Abstract. This study analyses data assimilative numerical simulations in an eddy-dominated western boundary current: the East Auckland Current (EAuC). The goal is to assess impact of assimilating surface and subsurface into a model EAuC via running observing system experiments (OSEs). We used Regional Ocean Modeling System (ROMS) conjunction with 4-dimensional variational (4D-Var) assimilation scheme incorporate sea height (SSH) temperature (SST), as well temperature, salinity velocity from...

10.5194/gmd-16-3675-2023 article EN cc-by Geoscientific model development 2023-07-06

Abstract Intra-annual variability in the East Auckland Current (EAuC) was studied using a year-long timeseries of situ and remotely-sensed velocity, temperature salinity observations. Satellite-derived velocities correlated well ( $$\hbox {r} &gt; 0.75$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>r</mml:mtext> <mml:mo>&gt;</mml:mo> <mml:mn>0.75</mml:mn> </mml:mrow> </mml:math> ) with observations well-represent long-term $$&gt; 30$$ <mml:mn>30</mml:mn>...

10.1038/s41598-021-89222-3 article EN cc-by Scientific Reports 2021-05-07

Abstract. This study analyses data assimilative numerical simulations in an eddy-dominated western boundary current: the East Auckland Current (EAuC). The goal is to assess impact of assimilating surface and subsurface into a model EAuC. We used Regional Ocean Modelling System (ROMS) conjunction with 4-dimensional variational (4D-Var) assimilation scheme incorporate sea height (SSH) temperature (SST), temperature, salinity, velocities from three moorings located at upper, mid lower...

10.5194/gmd-2022-270 preprint EN cc-by 2022-11-18
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