Modelling mass balance of cadmium in paddy soils under long term control scenarios

2018 ◽  
Vol 20 (8) ◽  
pp. 1158-1166 ◽  
Author(s):  
Wenli Feng ◽  
Zhaohui Guo ◽  
Chi Peng ◽  
Xiyuan Xiao ◽  
Lei Shi ◽  
...  
Keyword(s):  
Mass Balance ◽  
Paddy Soils ◽  
Balance Model ◽  
Mass Balance Model ◽  
Simple Mass ◽  
Simple Mass Balance Model

A simple mass balance model was developed for the change of Cd content in soils under long-term control scenarios.

scholarly journals A Simple Mass Balance Model for Lettuce - The Water Balance

2012 ◽  
Vol 45 (16) ◽  
pp. 1442-1447 ◽  
Author(s):  
Heather Maclean ◽  
Denis Dochain ◽  
Geoffrey Waters ◽  
Michael Stasiak ◽  
Mike Dixon ◽  
...  
Keyword(s):  
Water Balance ◽  
Mass Balance ◽  
Balance Model ◽  
Mass Balance Model ◽  
Simple Mass ◽  
Simple Mass Balance Model

scholarly journals Homogenization of long-term mass-balance time series

2009 ◽  
Vol 50 (50) ◽  
pp. 198-206 ◽  
Author(s):  
Matthias Huss ◽  
Andreas Bauder ◽  
Martin Funk
Keyword(s):  
Climate Change ◽  
Time Series ◽  
Mass Balance ◽  
Balance Model ◽  
Mass Balance Model ◽  
Significant Bias ◽  
Change Impact ◽  
Cumulative Mass ◽  
Measurement Period

AbstractThe re-analysis of long-term mass-balance time series is important to provide bias-corrected mass-balance data for climate-change impact studies. A method to homogenize time series of comprehensive mass-balance monitoring programmes is presented and applied to the nearly 50 year mass-balance records of Griesgletscher and Silvrettagletscher, Switzerland. Using a distributed mass-balance model in daily resolution we correct the mass-balance data for varying observation dates. Direct point measurements are combined with independent geodetic mass changes, a prerequisite for a thorough homogenization of mass-balance records. Differences between mass balance evaluated in the hydrological year or according to the measurement period and the stratigraphic system are analysed and may be up to ±0.5mw.e. a−1. Cumulative mass balance of both glaciers based on the glaciological method generally agrees well with geodetic mass change on the investigated glaciers. However, for Silvretta-gletscher a significant bias of +0.37mw.e. a−1 has been detected and corrected for since 1994.

scholarly journals The development of an approach to assess critical loads of acidity for woodland habitats in Great Britain

2004 ◽  
Vol 8 (3) ◽  
pp. 355-365 ◽  
Author(s):  
S. J. Langan ◽  
J. Hall ◽  
B. Reynolds ◽  
M. Broadmeadow ◽  
M. Hornung ◽  
...  
Keyword(s):  
Air Pollution ◽  
Steady State ◽  
Critical Load ◽  
Acid Deposition ◽  
Critical Loads ◽  
Balance Model ◽  
Mass Balance Model ◽  
Simple Mass ◽  
The Uk ◽  
Simple Mass Balance Model

Abstract. Alongside other countries that are signatories to the UNECE Convention Long Range Transboundary on Air Pollution, the UK is committed to reducing the impact of air pollution on the environment. To advise and guide this policy in relation to atmospheric emissions of sulphur and nitrogen, a critical load approach has been developed. To assess the potential impact of these pollutants on woodland habitats a steady state, simple mass balance model has been parameterised. For mineral soils, a Ca:Al ratio in soil solution has been used as the critical load indicator for potential damage. For peat and organic soils critical loads have been set according to a pH criterion. Together these approaches have been used with national datasets to examine the potential scale of acidification in woodland habitats across the UK. The results can be mapped to show the spatial variability in critical loads of the three principal woodland habitat types (managed coniferous, managed broadleaved/ mixed woodland and unmanaged woodland). The results suggest that there is a wide range of critical loads. The most sensitive (lowest) critical loads are associated with managed coniferous followed by unmanaged woodland on peat soils. Calculations indicate that at steady state, acid deposition inputs reported for 1995–1997 result in a large proportion of all the woodland habitats identified receiving deposition loads in excess of their critical load; i.e. critical loads are exceeded. These are discussed in relation to future modelled depositions for 2010. Whilst significant widespread negative impacts of such deposition on UK woodland habitats have not been reported, the work serves to illustrate that if acid deposition inputs were maintained and projected emissions reductions not achieved, the long-term sustainability of large areas of woodland in the UK could be compromised. Keywords: critical loads, acid deposition, acidification, woodland, simple mass balance model, sustainability

scholarly journals Quantifying flood-water impacts on a lake water budget via volume-dependent transient stable isotope mass balance

2020 ◽  
Author(s):  
Janie Masse-Dufresne ◽  
Florent Barbecot ◽  
Paul Baudron ◽  
John Gibson
Keyword(s):  
Surface Water ◽  
Mass Balance ◽  
Balance Model ◽  
Water Fluxes ◽  
Mass Balance Model ◽  
Surface Water Pollution ◽  
Flood Water ◽  
Isotope Mass Balance ◽  
Annual Water

Abstract. Interactions between groundwater and surface water are often overlooked in lake water budgets, even though groundwater can significantly contribute to the total annual water inputs to a lake. Isotope mass balance models have seen significant developments in the last decade for assessing the spatial and temporal variability of hydrological processes in lakes but are generally applied assuming steady-state. While this assumption is generally acceptable for long-term water balances of large lakes, it may be less appropriate for lakes which undergo strong seasonality of hydrological processes and meteorological conditions. In this study, a volume-dependent transient isotopic mass balance model was developed for an artificial lake (named Lake A) in Canada, and in a context where direct measurement of surface water fluxes is difficult, if not impossible. This lake typically receives important inputs of flood-water during the spring freshet period, as a hydraulic connection with a large watershed establishes each year. Quantification of the water fluxes to Lake A allowed to highlight the impacts of flood-water inputs over the annual water budget. The isotopic mass balance model revealed that groundwater and surface water inputs respectively account for 71 % and 28 % of the total annual water inputs to Lake A, which demonstrates its dependence on groundwater. An important part of these groundwater inputs is likely to correspond to flood-derived surface water due to bank storage. On an annual timescale, Lake A was found to be resilient to surface water pollution and sensitive to groundwater quantity and quality changes. There is however a likelihood that the resilience to surface water pollution is lower from April to August, as important water inputs originating from Lake DM contribute to the water balance via direct and indirect inputs (i.e., from bank storage). This suggests that the surface water fluxes between Lake DM and Lake A did not only have an impact on the dynamic of Lake A during springtime but also significantly influenced the long-term dynamics of Lake A. These findings can help anticipating the impacts of variation in the intensity and/or duration of future flooding events on lakes' water quality. From a more global perspective, this knowledge is useful for establishing regional-scale management strategies for maintaining water quality at flood-affected lakes in a context of land-use and climate changes.

Sign in / Sign up

Export Citation Format

Share Document