Pan-Pacific cities are home to nearly 55% of the world’s urban residents. As the fastest growing urban centers in the world, their growth comes with increasing demand for urban amenities such as greenspace. Yet, our understanding of greenspace trends within and among pan-Pacific cities is limited due to a lack of consistent long-term land cover data necessary for transnational comparisons. We tracked and compared greenspace patterns in 16 major pan-Pacific cities over 28 years. We asked: (1) How do long-term trends in greenspace heterogeneity differ among pan-Pacific cities? and (2) How do these patterns vary along urban–rural gradients? To characterize greenspace, we distinguished four vegetation density classes using normalized difference vegetation indices from annual Landsat composites spanning 1984–2012. First, we assessed long-term trends in greenspace spatial patterns. Second, we evaluated greenspace change along a gradient outward from city centers. We found that although GDP increased in all cities in recent decades, their greenspace patterns diverged into either greening or browning trends. In greening cities, expansion of dense vegetation, mostly in the outskirts of cities, resulted in greater greenspace connectivity. In contrast, browning cities lost dense vegetation in rural fringes, yet not in their urban centers. In Asian cities, dense vegetation increased in areal extent and connectivity over time as well as outward along the urban–rural gradient, in contrast to most North American cities. These differences in greenspace heterogeneity and connectivity over time and space imply that strategies and policies derived from North American cities may not be directly applicable to Asian cities.

泛太平洋城市居住着全球近55％的城市居民。作为世界上发展最快的城市中心，它们的增长伴随着对诸如绿地之类的城市便利设施的需求增加。但是，由于缺乏进行跨国比较所需的一致的长期土地覆盖数据，我们对泛太平洋城市内部和之间的绿地趋势的了解有限。在28年的时间里，我们跟踪并比较了16个主要的泛太平洋城市的绿地模式。我们问：（1）泛太平洋城市之间绿色空间异质性的长期趋势有何不同？（2）这些模式如何随城乡梯度变化？为了表征绿地，我们使用归一化差异植被指数从1984-2012年的年度Landsat复合资料中区分出四种植被密度类别。第一，我们评估了绿地空间格局的长期趋势。其次，我们评估了从城市中心向外的梯度的绿地变化。我们发现，尽管近几十年来所有城​​市的GDP都在增长，但其绿地模式却分化为绿色或棕色趋势。在绿化城市中，茂密的植被（主要是在城市郊区）的扩张导致了更大的绿地连通性。相反，褐变的城市在农村边缘地区失去了茂密的植被，但在城市中心地区却没有。与大多数北美城市相反，在亚洲城市中，茂密的植被随着时间的流逝在面积和连通性上以及沿城乡梯度的向外增加。