Alexander Forrest results 15
· Newest (Page 1/1, per page 25)
Author: Alexander Forrest ×Clear All Filters
Search Results
The Toxicology Investigators Consortium 2024 Annual ReportNARA Subscribed
The Toxicology Investigators Consortium 2023 Annual ReportNARA Subscribed
Wildfire smoke impacts lake ecosystemsNARA Subscribed
Wildfire activity is increasing globally. The resulting smoke plumes can travel hundreds to thousands of kilometers, reflecting or scattering sunlight and depositing particles within ecosystems. Several key physical, chemical, and biological processes in lakes are controlled by factors affected by smoke. The spatial and temporal scales of lake exposure to smoke are extensive and under‐recognized. We introduce the concept of th...
Internal phosphorus loading alters nutrient limitation and contributes to cyanobacterial blooms in a polymictic lakeNARA Subscribed
Clear Lake, a medium-sized hypereutrophic, polymictic lake in northern California, has had recurring harmful cyanobacteria blooms (HCBs) for over a century despite reductions in external phosphorus (P) loadings. Internal P loading can alter nutrient availability and limitation supporting HCBs but is rarely quantified or compared with external loads. We have quantified external P loads from 2019 to 2021 for the three main tribu...
Transitional circulation patterns from full ice cover to ice-off in a seasonally ice-covered lakeNARA Subscribed
There is consensus that under-ice circulation presents multiple phases through the winter, and that different mechanisms dominate each period. In this work, measurements of temperature, water velocity, conductivity, and dissolved oxygen from Lake Massawippi, Quebec, Canada, obtained during the ice-covered season in 2019, were used to characterize the time scales of different winter regimes and transitions among dominating circ...
Strong and sustained winds can drive dramatic hydrodynamic responses in density‐stratified lakes, with the associated transport and mixing impacting water quality, ecosystem function, and the stratification itself. Analytical expressions offer insight into the dynamics of stratified lakes during severe wind events. However, it can be difficult to predict the aggregate response of a natural system to the superposition of hydrod...
This work introduces a new method to calculate the water velocity components of a turbulent water column in the x, y, and z directions using Autonomous Underwater Vehicle (AUV) motion response (referred to as the ‘WVAM method’). The water column velocities were determined by calculating the difference between the motion responses of the vehicle in calm and turbulent water environments. The velocity components obtained using th...
A cyclonic gyre in an ice‐covered lakeNARA Subscribed
Observations of a cyclonic gyre in an ice‐covered, midsize ( 2 ), temperate lake are presented. Horizontal and vertical measurements of temperature and electrical conductivity measurements were collected using a conductivity‐temperature‐depth logger mounted on an autonomous underwater vehicle and additional instrumentation. These measurements revealed a cylindrical density anomaly with a radius of ∼110 m extending from the sur...
Convectively driven transport in temperate lakesNARA Subscribed
Penetrative convection in the surface layer of a midsize temperate lake (5 km 2 ) was investigated in both summer and winter using a conductivity‐temperature‐depth (CTD) logger mounted on an autonomous underwater vehicle (AUV) flown repeatedly along horizontal transects at selected depths. In summer, the epilimnion cooled differentially during a calm evening (240 and 297 W m −2 on the east and west sides of the lake, respectiv...
Previous1Next