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  • What causes sea level rise?

    海平面上升的原因是什麼?

  • If you've been to a beach before, you've probably noticed a sort of line where the ocean water meets the land.

    如果你曾經去過海邊,你可能會注意到海水與陸地間的某種交界線。

  • Of course ocean water doesn't stay at the same level all the time.

    當然,海水不會一直維持在同一個水平面上。

  • Waves and tides cause the level of the water to rise and sink all day long.

    波浪和潮汐會導致海水整天的上升和下降。

  • But we can measure the height of ocean water many times a day and figure out the water's average, or typical, height.

    但我們每天都可以多次測量海水的高度,並計算出海水的平均(或是典型)高度。

  • The average height of the ocean in a particular place is called the local sea level.

    特定地點的海洋平均高度被稱為「地方平均海面」。

  • But the ocean covers most of our planet.

    但海洋覆蓋了地球大部分的面積。

  • So, it's way too big to measure with just a ruler.

    所以它廣大到無法以尺進行測量。

  • NASA measures the average sea level of the whole ocean from space.

    NASA 會從太空測量整個海洋的平均海平面。

  • This measurement is called the global sea level.

    這項度量衡被稱為「全球海平面」。

  • People have been measuring local sea level at certain locations along the coast for hundreds of years,

    數百年來,人們都在沿岸某些地點測量地方平均海面,

  • and NASA has been measuring the global sea level for almost three decades.

    而 NASA 近三十年來則持續地測量全球海平面。

  • Over this time, scientists have observed that the global sea level has been rising.

    這段時間內,科學家們觀察到海平面不斷地上升。

  • The ocean is about 7 to 8 inches higher now than it was a century ago.

    海平面相較一世紀之前上升了 7 至 8 英吋。

  • Why?

    為什麼?

  • Because Earth is getting warmer.

    因為地球正在暖化。

  • Glaciers and ice sheets are large masses of ice that sit on land.

    冰川和冰層是在陸地上的大型冰體。

  • As our planet warms, this ice melts and flows into the ocean.

    隨著地球暖化,這些冰會融化並流入海洋。

  • More water in the ocean makes the sea level rise higher.

    海洋中的水量增加會使海平面上升更高。

  • But that's not the only way seas are rising.

    但這並不是海平面上升的唯一因素。

  • As Earth warms, the ocean is warming, too.

    隨著地球暖化,海水也會跟著變暖。

  • Water expands as it gets warmer.

    水會隨著溫度上升而膨脹。

  • So, warm water takes up more room in the ocean, making sea levels higher.

    因此,溫暖的海水在海洋中佔據更多空間,讓海平面更高。

  • Rising sea levels can have an impact on how we live, especially in communities near the coasts.

    上升的海平面可能會對我們的生活造成影響,尤其是沿海社區。

  • NASA and its partners use the Jason satellites to measure global sea level.

    NASA 與其合作夥伴透過傑森衛星來測量全球海平面。

  • It takes approximately 10 days for the satellites to complete one measurement.

    衛星完成一次完整測量大約需要 10 天。

  • And after they finish one measurement, they start measuring all over again.

    當結束一次測量後,它們會開始重新測量。

  • By keeping an eye on Earth's oceans like this, we can measure how much sea level is rising and how quickly it is happening.

    藉由這種方式密切關注海洋,我們能夠測量海平面上升的高度和速度。

  • Find out more about our planet at NASA Climate Kids.

    請到 NASA Climate Kids 獲得更多相關資訊。

What causes sea level rise?

海平面上升的原因是什麼?

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