Northeast Atlantic Ocean - Loire River - DIVAnd 4D seasonal analysis of Water body phosphate 1964/2019 v2021

Seasonal Climatology of Phosphate for Loire River for the period 1964-2019 and for the following seasons: <br> - winter: January-March,<br> - spring: April-June,<br> - summer: July-September,<br> - autumn: October-December<br> Observational data span from 1964 to 2019. <br> Depth levels (m): -125.0, -100.0, -75.0, -50.0,-40.0, -30.0, -25.0, -20.0, -15.0, -10.0, -8.0, -6.0, -4.0, -2.0, -0.0<br> Data Sources: observational data from SeaDataNet/EMODNet Chemistry Data Network.<br> Description of DIVAnd analysis: The computation was done with DIVAnd (Data-Interpolating Variational Analysis in n dimensions), version 2.7.4, using GEBCO 30sec topography for the spatial connectivity of water masses. The horizontal resolution of the produced DIVAnd maps grids is 0.01 degrees. Correlation length was optimized and filtered vertically and a seasonally-averaged profile was used. Signal to noise ratio was fixed to 1. Logarithmic transformation applied to the data prior to the analysis. Background field: the data mean value is subtracted from the data. The weight of time series was decreased by a factor of 10 relative to the weight of the profiles to account for the redundancy in the time series observations. Detrending of data: no, Advection constraint applied: no. Units: umol/l.

1964年至2019年卢瓦尔河磷酸盐季节气候学数据集，覆盖以下季节：<br>冬季：1月—3月，<br>春季：4月—6月，<br>夏季：7月—9月，<br>秋季：10月—12月。<br>观测数据的时间跨度为1964年至2019年。<br>深度层级（单位：米）：-125.0、-100.0、-75.0、-50.0、-40.0、-30.0、-25.0、-20.0、-15.0、-10.0、-8.0、-6.0、-4.0、-2.0、-0.0。<br>数据来源：SeaDataNet/EMODNet化学数据网络的观测数据。<br>DIVAnd分析说明：本次计算采用版本为2.7.4的DIVAnd (Data-Interpolating Variational Analysis in n dimensions)，使用GEBCO 30秒地形数据表征水团的空间连通性。生成的DIVAnd制图网格水平分辨率为0.01度。相关长度已完成垂直优化与滤波，并采用季节平均剖面。信噪比固定为1。分析前已对数据实施对数变换。背景场处理：从数据中扣除数据均值。为抵消时间序列观测的冗余性，时间序列的权重较剖面权重降低10倍。数据去趋势：未执行。平流约束：未施加。单位：微摩尔每升（μmol/L）。