Alan Jones results 132
· Newest (Page 1/6, per page 25)
Author: Alan Jones ×Clear All Filters
Search Results
The Atlantic meridional overturning circulation (AMOC) is expected to decline dramatically over the 21st century, with severe impacts for Northern Hemisphere climate. After 20 years of sustained monitoring in the subtropics, a detectable AMOC weakening trend is now beginning to emerge. However, continuous observations at subpolar latitudes are currently too short-lived to determine any weakening signal above the large-amplitud...
The Influence of Atmospheric Tides on the Variability of the Mesosphere–Thermosphere–IonosphereNARA Subscribed
This paper is a collaborative effort that originated at the International Space Science Institute Workshop on “Physical Links between Weather and Climate in Space and the Lower Atmosphere” held on January 22-26, 2024. Our goals are to survey the role of tides in facilitating the coupling of the lower and upper atmosphere and identify pathways forward that address challenges to our current understanding. To that end, we provide...
Do climate models agree on seasonal rainfall patterns and future changes over Southern Africa?NARA Subscribed
Understanding how rainfall will change over the southern Africa is a challenge, in part, due to large uncertainties in climate model projections. Using a large set of 201 global climate model simulations from the Coupled Model Intercomparison Project Phases 5 and 6 (CMIP5 and CMIP6) and 2018 UK Climate Projections (UKCP18), this study provides an in-depth investigation into future changes in southern African precipitation. Spe...
The bottom mixed layer (BML) of the abyssal ocean regulates heat exchange between the deep interior and seafloor, driving water–mass transformation and influencing global circulation. Spatial variability of the BML was examined in the under-sampled abyssal Pacific Ocean using surface-to-seafloor temperature and pressure observations over 4 months in 2023–2024. Given the typical decadal repeat rate of global hydrographic sectio...
The Rockall Trough, northwest of Scotland and Ireland, is a key conduit for the North Atlantic Current (NAC) and European Slope Current (ESC) transporting heat and salt toward the Nordic Seas and Arctic Ocean while mediating exchanges between the open ocean and the European shelf. We present a decade-long record of Rockall Trough circulation from the Ellett Array providing the first continuous estimates of heat and freshwater...
Voxel-wise insights into early Alzheimer’s disease pathology progression: the association with APOE and memory declineNARA Subscribed
Longitudinal investigation of the Apolipoprotein E (APOE) genotype’s impact on Alzheimer’s disease (AD) biomarker progression, focusing on amyloid beta (Aβ) accumulation and gray matter (GM) atrophy, integrating cognitive decline and baseline levels. Longitudinal florbetapir-PET and T1-weighted MRI data from 100 cognitively normal (CN) and mild cognitive impaired (MCI) participants both with considerable global Aβ accumulation...
Complementary value of molecular, phenotypic, and functional aging biomarkers in dementia predictionNARA Subscribed
DNA methylation age (MA), brain age (BA), and frailty index (FI) are putative aging biomarkers linked to dementia risk. We investigated their relationship and combined potential for prediction of cognitive impairment and future dementia risk using the ADNI database. Of several MA algorithms, DunedinPACE and GrimAge2, associated with memory, were combined in a composite MA alongside BA and a data-driven FI in predictive analyse...
Anticipating how rain-on-snow events will change through the 21st century: lessons from the 1997 new year’s flood eventNARA Subscribed
The California-Nevada 1997 New Year’s flood was an atmospheric river (AR)-driven rain-on-snow (RoS) event and remains the costliest in their history. The joint occurrence of saturated soils, rainfall, and snowmelt generated inundation throughout northern California-Nevada. Although AR RoS events are projected to occur more frequently with climate change, the warming sensitivity of their flood drivers across scales remains unde...
Quantification of age-related changes in the structure and mechanical function of skin with multiscale imagingNARA Subscribed
The mechanical properties of skin change during aging but the relationships between structure and mechanical function remain poorly understood. Previous work has shown that young skin exhibits a substantial decrease in tissue volume, a large macro-scale Poisson’s ratio, and an increase in micro-scale collagen fiber alignment during mechanical stretch. In this study, label-free multiphoton microscopy was used to quantify how th...