scholarly journals Temporal variability of rainwater iron speciation at the Bermuda Atlantic Time Series Station

2003 ◽  
Vol 108 (C8) ◽  
Author(s):  
Robert J. Kieber
Keyword(s):  
Time Series ◽  
Temporal Variability ◽  
Iron Speciation

scholarly journals Recent changes and drivers of the atmospheric evaporative demand in the Canary Islands

2016 ◽  
Author(s):  
S. M. Vicente-Serrano ◽  
C. Azorin-Molina ◽  
A. Sanchez-Lorenzo ◽  
A. El Kenawy ◽  
N. Martín-Hernández ◽  
...  
Keyword(s):  
Time Series ◽  
Relative Humidity ◽  
Canary Islands ◽  
Temporal Variability ◽  
Meteorological Factors ◽  
Negative Consequences ◽  
Evaporative Demand ◽  
High Quality ◽  
Radiative Component ◽  
Main Driver

Abstract. We analysed recent evolution and meteorological drivers of the atmospheric evaporative demand (AED) in the Canary Islands for the period 1961–2013. We employed long and high quality time series of meteorological variables to analyze current AED changes in this region and found that AED has increased during the investigated period. Overall, the annual ETo increased significantly by 18.2 mm decade−1 on average, with a stronger trend in summer (6.7 mm decade−1). The radiative component showed much lower temporal variability than the aerodynamic component did. Thus, more than 90 % of the observed ETo variability at the seasonal and annual scales can be associated with the variability of the aerodynamic component. The variable that recorded more significant changes in the Canary Islands was relative humidity, and among the different meteorological factors used to calculate ETo, relative humidity was the main driver of the observed ETo trends. The observed trend could have negative consequences in a number of water-depending sectors if it continues in the future.

scholarly journals Temporal variability of vertical export flux at the DYFAMED time-series station (Northwestern Mediterranean Sea)

2013 ◽  
Vol 119 ◽  
pp. 59-67 ◽  
Author(s):  
Lars-Eric Heimbürger ◽  
Héloïse Lavigne ◽  
Christophe Migon ◽  
Fabrizio D’Ortenzio ◽  
Claude Estournel ◽  
...  
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Temporal Variability ◽  
Export Flux ◽  
Northwestern Mediterranean Sea ◽  
Vertical Export ◽  
Northwestern Mediterranean

Transient Tracers and Anthropogenic Carbon in Central Labrador Sea: a Multi-Decadal Study

2020 ◽  
Author(s):  
Lorenza Raimondi ◽  
Kumiko Azetsu-Scott ◽  
Toste Tanhua ◽  
Igor Yashayaev ◽  
Doug Wallace
Keyword(s):  
Time Series ◽  
Temporal Variability ◽  
Dissolved Inorganic Carbon ◽  
Mixed Layer Depth ◽  
Monitoring Program ◽  
Time History ◽  
Labrador Sea ◽  
Full Time ◽  
Time Varying ◽  
Anthropogenic Carbon

<p>Over the last thirty years the Bedford Institute of Oceanography (BIO) has been maintaining the Atlantic Zone Off-Shore Monitoring Program (AZOMP), which includes annual occupation of several sections and stations in the Northwest Atlantic Ocean. Among these, the AR7W line across the Labrador Sea has one of the longest time-series where both transient tracers and dissolved inorganic carbon (DIC) have been collected since the early 1990s.</p><p>Among multiple transient tracers that have been measured along this transect (CFC-11, CFC-113, CCl<sub>4</sub> and SF<sub>6</sub>), only measurement of CFC-12 extends over the full time-series from 1992 to 2018, overlapping with DIC observations. Measurements of CFC-12 were also available for a previous cruise in 1986, extending the time-series to three decades.</p><p>In this work we present the temporal variability of CFC-12 (1986-2016) and DIC (1992-2016) concentrations as well as their distribution in the major water masses of the region.</p><p>The CFC-12 data are used to reconstruct the time-history of the tracer’s saturation at the time of convection based on multiple regression with the atmospheric input function of CFC-12 and the annual maximum mixed layer depth. The so-modelled time-varying saturation is employed to relax the constant saturation assumption of the Transit Time Distribution (TTD) method, allowing for a better estimate of anthropogenic carbon (C<sub>ant</sub>) in the region.</p><p>We present the column inventories and storage rate of C<sub>ant</sub> in central Labrador Sea between 1986 and 2016 obtained using the TTD method with time-varying saturation. We compare these estimates with a classical TTD approach that assumes constant saturation, and we highlight the differences in trends and magnitudes obtained with the two approaches.    </p><p>Finally, our work shows the multi-decadal dataset of DIC in the Labrador Sea which enables a comparison between the TTD-based C<sub>ant</sub> estimates and the measured DIC trends, providing insights into temporal variability of natural carbon in the region.</p>

Hydrogen peroxide at the Bermuda Atlantic Time Series Station: Temporal variability of seawater hydrogen peroxide

2005 ◽  
Vol 97 (3-4) ◽  
pp. 236-244 ◽  
Author(s):  
G. Brooks Avery ◽  
William J. Cooper ◽  
Robert J. Kieber ◽  
Joan D. Willey
Keyword(s):  
Hydrogen Peroxide ◽  
Time Series ◽  
Temporal Variability

scholarly journals Analyzing spatial and temporal variability in short-term rates of post-fire vegetation return from Landsat time series

2018 ◽  
Vol 205 ◽  
pp. 32-45 ◽  
Author(s):  
Ryan J. Frazier ◽  
Nicholas C. Coops ◽  
Michael A. Wulder ◽  
Txomin Hermosilla ◽  
Joanne C. White
Keyword(s):  
Time Series ◽  
Temporal Variability ◽  
Spatial And Temporal Variability ◽  
Short Term

scholarly journals Variación espacio-temporal del vapor de agua precipitable (PWV) en la costa norte del Perú para el periodo 2001-2017

2018 ◽  
pp. 102-108
Keyword(s):  
Time Series ◽  
Water Vapor ◽  
Temporal Variability ◽  
Extreme Values ◽  
Power Spectral Analysis ◽  
Precipitable Water ◽  
Precipitable Water Vapor ◽  
Spatial And Temporal Variability ◽  
Northern Coast ◽  
San Marcos

Variación espacio-temporal del vapor de agua precipitable (PWV) en la costa norte del Perú para el periodo 2001-2017  Jhon Brayan Guerrero Salinas, Rolando Renee Badaracco Meza, Joel Rojas Acuña Universidad Nacional Mayor de San Marcos, Ap. Postal 14-0149, Lima, Perú Recibido 11 de octubre del 2018, Revisado el 7 de diciembre de 2018. Aceptado el 12 de diciembre de 2018 DOI: https://doi.org/10.33017/RevECIPeru2018.0016/ Resumen El objetivo de este estudio fue realizar el análisis de la variabilidad espacial y temporal de la columna de vapor de agua precipitable (PWV, por sus siglas en inglés) en la costa norte del Perú (3°S-7°S). Se analizaron un total de 17 años de datos PWV obtenidas del sensor MODIS/Terra, de las cuales se generaron mapas de climatología provisional y de desviación estándar, para así obtener los patrones de distribución espacial promedio y variabilidad temporal. El mapa climatológico provisional de PWV muestra en general que las zonas de mayor variabilidad de PWV se encuentran en el océano y tierras bajas, mientras que las zonas de menor variabilidad se encuentran en la región de los Andes. Los diagramas de Hovmöller y la serie de tiempo identificaron un ciclo anual y el aumento de los valores extremos en los meses de verano a partir del año 2010. El análisis espectral de potencia de la serie de tiempo aparte de identificar el periodo anual también identifica un periodo semianual que se debe al cambio estacional verano-invierno. Descriptores: Vapor de agua precipitable, Costa norte, MODIS/TERRA, Hovmöller. Abstract The objective of this study was to perform the analysis of the spatial and temporal variability of the precipitable water vapor column (PWV) on the northern coast of Peru (3°S-7°S). A total of 17 years of PWV data obtained from the MODIS/Terra sensor were analyzed, from which maps of provisional climatology and standard deviation were generated, in order to obtain the patterns of average spatial distribution and temporal variability. The provisional climatological map of PWV shows in general that the areas with the greatest variability of PWV are found in the ocean and lowlands, while the areas of least variability are found in the Andes region. The Hovmöller diagrams and the time series identified an annual cycle and the increase of the extreme values in the summer months from the year 2010. The power spectral analysis of the time series apart from identifying the annual period also identifies a period semiannual that is due to the seasonal change summer-winter. Keywords: Precipitable water vapor, Northern coast, MODIS/TERRA, Hovmöller.

scholarly journals Variability in upwelling across the tropical tropopause and correlations with tracers in the lower stratosphere

2012 ◽  
Vol 12 (23) ◽  
pp. 11505-11517 ◽  
Author(s):  
M. Abalos ◽  
W. J. Randel ◽  
E. Serrano
Keyword(s):  
Time Series ◽  
Temporal Variability ◽  
Seasonal Cycle ◽  
Strong Influence ◽  
Lower Stratosphere ◽  
Momentum Balance ◽  
Annual Cycles ◽  
Tropical Tropopause ◽  
Vertical Gradients ◽  
Good Agreement

Abstract. Temporal variability of the upwelling near the tropical tropopause on daily to annual timescales is investigated using three different estimates computed from the ERA-Interim reanalysis. These include upwelling archived by the reanalysis, plus estimates derived from thermodynamic and momentum balance calculations. Substantial variability in upwelling is observed on both seasonal and sub-seasonal timescales, and the three estimates show reasonably good agreement. Tropical upwelling should exert strong influence on temperatures and on tracers with large vertical gradients in the lower stratosphere. We test this behavior by comparing the calculated upwelling estimates with observed temperatures in the tropical lower stratosphere, and with measurements of ozone and carbon monoxide (CO) from the Aura Microwave Limb Sounder (MLS) satellite instrument. Time series of temperature, ozone and CO are well correlated in the tropical lower stratosphere, and we quantify the influence of tropical upwelling on this joint variability. Strong coherent annual cycles observed in each quantity are found to reflect the seasonal cycle in upwelling. Statistically significant correlations between upwelling, temperatures and tracers are also found for sub-seasonal timescales, demonstrating the importance of upwelling in forcing transient variability in the lower tropical stratosphere.

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