What's more, a La Nina effect, bringing cold water to the eastern equatorial Pacific, has taken hold.

而且更为重要的是，在拉尼娜现象的作用之下，冰冷的海水被带到东太平洋赤道处。

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Gray says the ocean's thermal heat capacity is high and sea-surface temperatures are increasing; what's more, a La Nina effect, bringing cold water to the eastern equatorial Pacific, has taken hold.

格雷表示，目前海洋的热容量很高，海面温度也在不断上升；而且更为重要的是，在拉尼娜现象的作用之下，冰冷的海水被带到东太平洋赤道处。

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The forecasts take into account el Nino and la Nina, ballooning greenhouse gas levels as well as solar effect and natural variations in the world's oceans.

这些预报考虑到了厄尔尼诺现象、拉-尼娜现象、不断增长的温室气体水平以及太阳活动和全球海洋的自然变化。

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But this year, the La Nina effect no longer applies.

BBC: Met Office cools summer forecast

Temperatures in both previous years were dragged down by the Pacific La Nina effect which makes it four times more likely that we will suffer a bad summer in Europe.

BBC: Met Office cools summer forecast