Dominant scales of subtidal variability in coastal hydrography of the Northern Chilean Patagonia

Narváez, Diego A.; Vargas, Cristian A.; Cuevas, L. Antonio; García-Loyola, S; Lara, Carlos; Segura, C. J.; Tapia, Fabián J.; Broitman, Bernardo R.

doi:10.1016/j.jmarsys.2018.12.008

Cited by 49 publications

(27 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A disruption of the annual cycle in surface Chl-a concentration and nFLH took place during the early 2010's across the study region. This breakdown of the seasonal cycle and its relation to the antiphase between SAM (negative phase) and ENSO has been reported for the region before [16,24]. Briefly, after a prolonged near-neutral period during the early 2000's, the SAM experienced positive anomalies, firstly during the observed multidecadal antiphase with ENSO, and culminating with an in-phase period during the 2015-2016 warm ENSO event [39,64].…”

Section: Discussionsupporting

confidence: 66%

“…Variability over higher frequencies and the 2-year mode after 2011 appears to be linked to SAM, whereas more extended periods of oscillation, such as 2-3-year mode before 2011 and the 4-5 years mode appear to be associated mainly to SOI, while after 2011 SAM appears as an essential contributor over the same temporal scales. The higher biological activity in the northern area could be related to coastal topography and the presence of a cluster of smaller islands driving strong physical-biological coupling in the sector [16,24,62]. Iriarte et al [63] showed significant associations between autotrophic abundance and streamflow of the Puelo River, which drains in the central part of the northern sector.…”

Section: Discussionmentioning

confidence: 99%

“…The northern Patagonia ecosystem is a temperate coastal ecosystem on the edge of the southeast Pacific, where the storm track of the West Wind Drift Current impinges the shores of South America along the Valdivia Rainforest ecoregion [22]. The marine and terrestrial environments are influenced by large-scale climatic variability through changes in precipitation [23] and the properties of the water masses that flow alongshore [24,25]. The region sustains great food and forestry industries that are among the top five producers globally [26].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coupled Biospheric Synchrony of the Coastal Temperate Ecosystem in Northern Patagonia: A Remote Sensing Analysis

et al. 2019

Self Cite

View full text Add to dashboard Cite

Over the last century, climate change has impacted the physiology, distribution, and phenology of marine and terrestrial primary producers worldwide. The study of these fluctuations has been hindered due to the complex response of plants to environmental forcing over large spatial and temporal scales. To bridge this gap, we investigated the synchrony in seasonal phenological activity between marine and terrestrial primary producers to environmental and climatic variability across northern Patagonia. We disentangled the effects on the biological activity of local processes using advanced time-frequency analysis and partial wavelet coherence on 15 years (2003–2017) of data from MODIS (Moderate Resolution Imaging Spectroradiometer) onboard the Terra and Aqua satellites and global climatic variability using large-scale climate indices. Our results show that periodic variations in both coastal ocean and land productivity are associated with sea surface temperature forcing over seasonal scales and with climatic forcing over multi-annual (2–4 years) modes. These complex relationships indicate that large-scale climatic processes primarily modulate the synchronous phenological seasonal activity across northern Patagonia, which makes these unique ecosystems highly exposed to future climatic change.

show abstract

Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Coupled Biospheric Synchrony of the Coastal Temperate Ecosystem in Northern Patagonia: A Remote Sensing Analysis

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous studies using combinations of ERA Interim reanalysis and GCM multimodel simulations (Aguirre et al, 2018), together with primary data from QuikScat and ASCAT scatterometers (Schneider et al, 2017), have also documented the increased SPA poleward spring displacement, lending support to our results. The displacement has led to the intensification of spring winds at the southern-end of HUE (Jacob et al, 2018;Narváez et al, 2019), and a region of weaker spring winds in central Chile, between 30º-35°S. Decreased upwelling winds in this extensive region of the Chilean coast has caused a weak but significant trend to increasing SST, which is particularly apparent in front of the upwelling hot-spots of Matanzas (34.1°S), Punta Toro (33.8°S) and at the well-documented upwelling centre of Punta Lengua de Vaca (30.2°S).…”

Section: Discussionmentioning

confidence: 99%

Spatial shifts in productivity of the coastal ocean over the past two decades induced by migration of the Pacific Anticyclone and Bakun's effect in the Humboldt Upwelling Ecosystem

Weidberg

Ospina-Álvarez

Bonicelli

et al. 2020

Global and Planetary Change

Self Cite

View full text Add to dashboard Cite

Intensification and poleward expansion of upwelling-favourable winds have been predicted as a response to anthropogenic global climate change and have recently been documented in most Eastern Boundary Upwelling Ecosystems of the world. To identify how these processes are impacting nearshore oceanographic habitats and, especially, long-term trends of primary productivity in the Humboldt Upwelling Ecosystem (HUE), we *

show abstract

“…In terms of time-distance scales, atmospheric systems have been categorized as macro-, meso-, and microscale (Orlanski, 1975;Ray, 1986;Holton, 1992). The macroscale def-inition is divided into planetary and synoptic scales.…”

Section: Introductionmentioning

confidence: 99%

Synoptic-scale variability of surface winds and ocean response to atmospheric forcing in the eastern austral Pacific Ocean

et al. 2019

View full text Add to dashboard Cite

Abstract. In the Southern Hemisphere, macroscale atmospheric systems such as westerly winds and the southeast Pacific subtropical anti-cyclone (SPSA) influence the wind regime of the eastern austral Pacific Ocean. The average and seasonal behaviors of these systems are well known, although wind variability at different time and distance scales remains largely unexamined. Therefore, the main goal of this study was to determine the variabilities of surface winds on a spatiotemporal scale from 40 to 56∘ S, using QuikSCAT, Advanced Scatterometer (ASCAT), and the fifth major global European Centre for Medium-Range Weather Forecasts (ECMWF) reanalysis (ERA5) surface-wind information complemented with in situ meteorological data. In addition, interactions between the atmospheric systems, together with the ocean–atmosphere response, were evaluated for the period 1999–2018. The empirical orthogonal function detected dominance at the synoptic scale in mode 1, representing approximately 30 % of the total variance. In this mode, low and high atmospheric pressure systems characterized wind variability for a 16.5 d cycle. Initially, mode 2 – which represents approximately 22 % of the variance – was represented by winds from the west/east (43–56∘ S), occurring mostly during spring and summer/fall and winter at an annual timescale (1999–2008) until they were replaced by systems cycling at 27.5 d (2008–2015). This reflects the influence of the baroclinic annular mode in the Southern Hemisphere. Mode 3, representing approximately 15 % of the variance, involved the passage of small-scale low and high atmospheric pressure (LAP and HAP) systems throughout Patagonia. Persistent Ekman suction occurred throughout the year south of the Gulf of Penas and beyond the Pacific mouth of the Strait of Magellan. Easterly Ekman transport (ET) piled these upwelled waters onto the western shore of South America when winds blew southward. These physical mechanisms were essential in bringing nutrients to the surface and then transporting planktonic organisms from the oceanic zone to Patagonian fjords and channels. In the zonal band between 41 and 43∘ S, the latitude of Chiloé Island, upward Ekman pumping and Ekman transport during spring and summer favored a reduced sea surface temperature and increased chlorophyll a (Chl a) levels; this is the first time that such Ekman upwelling conditions have been reported so far south in the eastern Pacific Ocean. The influence of the northward-migrating LAP systems on the ocean–atmosphere interphase allowed us to understand, for the first time, their direct relationship with recorded nighttime air temperature maxima (locally referred to as “nighttime heatwave events”). In the context of global climate change, greater attention should be paid to these processes based on their possible impact on the rate of glacier melting and on the austral climate.

show abstract

Dominant scales of subtidal variability in coastal hydrography of the Northern Chilean Patagonia

Cited by 49 publications

References 54 publications

Coupled Biospheric Synchrony of the Coastal Temperate Ecosystem in Northern Patagonia: A Remote Sensing Analysis

Coupled Biospheric Synchrony of the Coastal Temperate Ecosystem in Northern Patagonia: A Remote Sensing Analysis

Spatial shifts in productivity of the coastal ocean over the past two decades induced by migration of the Pacific Anticyclone and Bakun's effect in the Humboldt Upwelling Ecosystem

Synoptic-scale variability of surface winds and ocean response to atmospheric forcing in the eastern austral Pacific Ocean

Contact Info

Product

Resources

About